If you have an IUD (or recently had one) and think you might be pregnant, and you develop severe or one-sided pelvic or lower-abdominal pain, pain at the tip of your shoulder, dizziness, lightheadedness or fainting, or abnormal vaginal bleeding, this can be a sign of an ectopic pregnancy – a pregnancy growing outside the uterus that can be life-threatening. Call 911 or go to the nearest emergency room now. Take a pregnancy test if you can, but do not delay emergency care to do so, and do not try to remove the IUD yourself.
Discovering the symptoms of pregnancy with IUD can be both unexpected and alarming, since intrauterine devices are among the most effective forms of birth control available. While IUDs have a failure rate of less than one percent, no contraceptive method is 100 percent effective, and pregnancies do occasionally occur. Recognizing the symptoms of pregnancy with IUD early is critically important because IUD pregnancies carry unique risks, including a higher chance of ectopic pregnancy, which is a medical emergency.
If you have an IUD and are experiencing unusual symptoms such as a missed period, nausea, breast tenderness, or unexpected bleeding patterns, it is worth considering the possibility of pregnancy and taking action promptly. This guide walks you through the signs to watch for, the specific risks associated with IUD pregnancy, and the steps you should take if you suspect you may be pregnant with an IUD in place. It is educational only and is not a substitute for evaluation by a qualified clinician.
How Can Pregnancy Happen With an IUD?
IUDs are among the most reliable contraceptive methods, with effectiveness rates exceeding 99 percent for both hormonal IUDs (such as Mirena, Kyleena, Liletta, and Skyla) and copper IUDs (Paragard, and the newer low-dose copper device Miudella, cleared by the FDA in 2025). However, pregnancy can still occur in rare circumstances.
According to the American College of Obstetricians and Gynecologists, the small failure rate means that out of every 1,000 people using an IUD for one year, only a few become pregnant, with the exact number depending on the type of IUD. Pregnancy is more likely if the IUD has shifted from its correct position in the uterus (malposition or partial expulsion), if the IUD has been expelled without the user realizing it, or during the first few days after insertion before the device is fully effective (a copper IUD works immediately, while a hormonal IUD placed outside the first week of a cycle may need up to seven days plus backup contraception).
The risk is also slightly higher in the first year of use. If you have concerns about your IUD’s position, periodic string checks and follow-up appointments with your healthcare provider can help confirm it is properly placed. For more on reproductive health, visit our medical conditions guide.
Common Early Symptoms of Pregnancy With an IUD
The early symptoms of pregnancy with an IUD are largely the same as those of any early pregnancy, but they can be harder to recognize because many IUD users – particularly those with hormonal IUDs – already have irregular or absent periods. Here are the most common signs to watch for.
Missed or changed period: For people who still menstruate with their IUD, a missed period is often the first signal. However, many hormonal-IUD users have very light periods or none at all, which makes this symptom less reliable. If you normally have regular periods with your IUD and they suddenly stop, or if you notice a significant change in your bleeding pattern, consider pregnancy as a possibility.
Nausea and vomiting: “Morning sickness” typically begins around six weeks of pregnancy, though it can start as early as four weeks and can occur at any time of day. If you develop unexplained nausea, particularly when triggered by certain smells, this is a key symptom to pay attention to.
Breast tenderness and changes: Hormonal changes in early pregnancy can make the breasts sore, swollen, and sensitive. The areolas may darken, and the breasts may feel heavier than usual. Because hormonal IUDs can themselves cause some breast tenderness, a noticeable increase or a new onset of this symptom is what should raise awareness.
Additional Signs That May Indicate Pregnancy
Beyond the most classic symptoms, several other signs may suggest pregnancy in an IUD user.
Unusual spotting or bleeding: Light spotting that differs from your normal pattern can be a sign of implantation bleeding, which happens when a fertilized egg attaches to the uterine lining, usually around 10 to 14 days after conception; it is typically lighter and shorter than a regular period. Important caveat: with an IUD in place, any new or abnormal bleeding combined with a positive or possible pregnancy also needs urgent evaluation to rule out an ectopic pregnancy – do not simply assume it is harmless implantation bleeding.
Fatigue: Extreme tiredness that seems out of proportion to your activity level is very common in early pregnancy. The rise in progesterone during the first trimester is largely responsible for this overwhelming fatigue.
Frequent urination: Needing to urinate more often than usual, particularly at night, can begin in early pregnancy because of hormonal changes and increased blood volume, even before the growing uterus starts pressing directly on the bladder.
Food aversions or cravings: Sudden changes in food preferences, particularly aversions to foods or smells you previously tolerated, can be an early pregnancy indicator. These changes are driven by hormonal shifts and can appear very early in the first trimester. Related hormonal changes are discussed in our article on symptoms of low progesterone.
Warning Signs of Ectopic Pregnancy
One of the most important reasons to recognize symptoms of pregnancy with an IUD early is the increased risk of ectopic pregnancy. An ectopic pregnancy occurs when a fertilized egg implants outside the uterus, most commonly in a fallopian tube. According to the Mayo Clinic, IUDs are excellent at preventing pregnancy inside the uterus; but on the rare occasions when pregnancy does occur with an IUD in place, a higher proportion of those pregnancies are ectopic compared with the general population. An IUD does not cause ectopic pregnancy – it simply changes the odds of where a rare failure ends up.
Seek emergency care immediately for any of the following with a positive or possible pregnancy: sharp or one-sided pelvic or lower-abdominal pain; shoulder-tip pain; dizziness, lightheadedness, or fainting; heavy or abnormal vaginal bleeding; or signs of shock (rapid pulse, cold clammy skin, confusion). A ruptured ectopic pregnancy causes dangerous internal bleeding and is fatal without prompt surgery or treatment.
Watch for these warning signs and seek immediate care if they develop.
Sharp, stabbing pelvic or abdominal pain: Pain localized to one side of the pelvis or lower abdomen that is sharp rather than crampy can indicate an ectopic pregnancy. The pain may come and go at first but can become severe and constant if the ectopic pregnancy ruptures.
Shoulder pain: Pain at the tip of the shoulder, particularly when lying down, can be a sign of internal bleeding from a ruptured ectopic pregnancy. This “referred” pain occurs because blood irritates the diaphragm.
Dizziness, lightheadedness, or fainting: These symptoms, especially when accompanied by pelvic pain and vaginal bleeding, may indicate internal bleeding and require emergency care.
Heavy or abnormal vaginal bleeding: Bleeding that is heavier than your normal period or occurs at an unexpected time, particularly when combined with pelvic pain, should be evaluated urgently.
What to Do If You Suspect Pregnancy With an IUD
If you are experiencing symptoms that suggest pregnancy, taking prompt action is important for your own health.
Take a home pregnancy test: Modern home pregnancy tests are highly accurate and can detect pregnancy as early as the first day of a missed period. The IUD does not interfere with the result. If the test is positive, contact your healthcare provider right away, because an IUD pregnancy requires medical evaluation regardless of your plans for the pregnancy. If you have any emergency red-flag symptoms, go to the ER whether or not you have been able to test.
Do not try to remove the IUD yourself: Under no circumstances should you attempt to remove the IUD on your own. Removal should only be performed by a healthcare provider who can assess the situation and manage any complications. Research summarized by the U.S. National Library of Medicine (MedlinePlus) indicates that professionally managed early IUD removal, when an intrauterine pregnancy is confirmed and the strings are visible, generally improves outcomes – but this is a clinician’s decision and procedure, never a do-it-yourself one.
Seek prompt medical evaluation: Your healthcare provider will confirm the pregnancy, determine its location (intrauterine versus ectopic) using ultrasound and blood tests (quantitative hCG levels), and discuss your options. If the pregnancy is inside the uterus and the IUD strings are visible, your provider will usually recommend removing the IUD, because leaving it in place increases the risk of miscarriage, preterm birth, and infection.
Risks of Continuing a Pregnancy With an IUD
If pregnancy occurs with an IUD in place and continues, there are several potential complications that your healthcare team will monitor for.
Miscarriage: The risk of miscarriage is significantly higher in IUD pregnancies. If the IUD is removed early, that risk decreases but remains somewhat elevated compared with pregnancies conceived without an IUD. If the IUD cannot be safely removed (for example, if the strings are not visible), the miscarriage risk is higher.
Preterm birth: IUD pregnancies carry a higher risk of preterm labor and delivery, which can affect the baby’s health. Close prenatal monitoring is essential.
Infection: A retained IUD in a pregnant uterus increases the risk of intrauterine infection (including septic miscarriage), which can be serious. This is another reason clinicians generally recommend early IUD removal when an intrauterine pregnancy occurs.
When to See a Doctor
If you have an IUD and experience any symptoms suggestive of pregnancy, see your healthcare provider as soon as possible. Do not wait to see whether symptoms resolve on their own. Seek emergency medical care immediately if you experience severe pelvic or abdominal pain (especially one-sided), heavy vaginal bleeding with dizziness or fainting, shoulder-tip pain with pelvic symptoms, or signs of shock (rapid pulse, cold clammy skin, confusion).
Even if your pregnancy test is negative but you are experiencing unusual symptoms with your IUD, it is worth getting checked. IUD displacement, pelvic infection, ovarian cysts, and other issues can mimic pregnancy symptoms and also require medical attention. For a deeper look at how ectopic pregnancy is diagnosed and treated, see our ectopic pregnancy guide.
Frequently Asked Questions
Can a pregnancy test be accurate with an IUD?
Yes. Home pregnancy tests are just as accurate for people with IUDs as for anyone else. The IUD does not interfere with the test’s ability to detect hCG (human chorionic gonadotropin), the hormone produced during pregnancy. If you get a positive result, contact your healthcare provider immediately. If you get a negative result but continue to have symptoms, repeat the test in a few days or ask your provider for a blood test – and seek urgent care if you develop any red-flag symptoms.
How common is pregnancy with an IUD?
Pregnancy with an IUD is rare, occurring in well under one percent of users per year. Hormonal IUDs and copper IUDs both exceed 99 percent effectiveness with typical use. While these numbers are very low, across the millions of people using IUDs, a small number do become pregnant each year – which is why knowing the warning signs still matters.
Will the IUD harm the baby if I continue the pregnancy?
If the IUD is removed early in pregnancy, outcomes are generally better. If it cannot be removed and the pregnancy continues, there is an increased risk of complications including miscarriage, preterm birth, and infection. Even so, many pregnancies with an IUD in place result in healthy deliveries when closely monitored. The IUD itself does not typically cause birth defects. Your obstetrician will guide you through the specific risks based on your situation.
Should I check my IUD strings regularly?
Periodic string checks can help you notice if the IUD has moved. You can check by washing your hands and inserting a clean finger into the vagina to feel for the strings coming through the cervix. If you cannot feel the strings, if they seem shorter or longer than usual, or if you can feel the hard plastic of the IUD itself, contact your healthcare provider – and use backup contraception in the meantime, because a displaced or expelled IUD may not be protecting you.
Can I get a new IUD after an IUD pregnancy?
In most cases, yes. A new IUD can usually be placed after an IUD pregnancy has been resolved. Your healthcare provider will consider the circumstances of the previous pregnancy (such as whether the IUD was displaced) and confirm proper placement of the new device. An IUD pregnancy does not necessarily mean IUDs are a poor option for you going forward, especially if the previous device was improperly positioned.
Does an IUD cause ectopic pregnancy?
No. An IUD does not cause ectopic pregnancy, and IUD users have a much lower overall risk of any pregnancy – ectopic or not – than people using no contraception. What changes is the proportion: because the IUD is so good at preventing pregnancy inside the uterus, on the rare occasion a pregnancy does slip through, it is more likely to be located outside the uterus. That is why any positive or suspected pregnancy with an IUD in place should be evaluated promptly.
Key Takeaways
While IUD pregnancies are rare, recognizing the symptoms of pregnancy with an IUD early is essential for your health and safety. Common signs include a missed or changed period, nausea, breast tenderness, fatigue, frequent urination, and unusual bleeding. Because IUD pregnancies carry an increased chance of ectopic pregnancy – a life-threatening emergency – any suspicion of pregnancy should be evaluated by a healthcare provider promptly, and severe one-sided pelvic pain, shoulder-tip pain, dizziness, or heavy bleeding means calling 911 or going to the ER without delay. Take a pregnancy test if you have symptoms, never try to remove the IUD yourself, and keep up with string checks and follow-up appointments. For more on reproductive and women’s health, visit our medical conditions guide.
Medical disclaimer: This article is general education, not medical advice, and is not a substitute for evaluation by a qualified clinician. If you may be pregnant with an IUD in place, contact a healthcare provider promptly, and seek emergency care for any of the red-flag symptoms above.
Sources
- American College of Obstetricians and Gynecologists (ACOG), Long-Acting Reversible Contraception (IUD and Implant) – acog.org
- Mayo Clinic, Ectopic pregnancy – mayoclinic.org
- MedlinePlus (U.S. National Library of Medicine), Intrauterine devices (IUD) – medlineplus.gov
- CDC, Contraception guidance for health care providers (IUD management) – cdc.gov