Pregnancy with a coil: Why a Positive Test Needs Prompt Assessment

Contact a clinician promptly if a pregnancy test is positive while you have a copper or hormonal coil. Tell the service about the device when asking for care, even if you feel well. The first priority is to establish where the pregnancy is and make a plan for the coil, rather than waiting for a routine pregnancy appointment.

A positive result needs assessment

Coils are highly effective contraception, but pregnancy can still occur. A positive result should not be dismissed simply because a device is present. A hormonal coil does not produce the pregnancy hormone measured by a home test.

An ectopic pregnancy develops outside the uterus. Assessment is important because this possibility must be considered when pregnancy occurs with a coil. You do not need pain or missing threads to justify contacting the service. If you have noticed a thread change, describe it; the missing threads guide explains why thread position alone cannot settle the question.

Know when to seek urgent help

Get urgent medical advice for lower abdominal pain, especially on one side, unusual bleeding or shoulder tip pain when pregnancy is possible. Do not wait for another test or a booked scan. An ectopic pregnancy may initially cause few symptoms, and a negative early test should not delay assessment of concerning pain.

Sudden severe abdominal pain, fainting, collapse or marked dizziness needs emergency care now. Tell the emergency team that pregnancy is possible and that you have a coil. You do not have to know the device brand before seeking help.

Expect a plan to locate the pregnancy

The team may use a vaginal ultrasound and blood hCG measurements. If the pregnancy is too early to locate, further tests or scans may be needed. Ask when the next check is due, who will contact you and what symptoms should lead you to return sooner.

A blood result alone does not locate the pregnancy. Keep attending planned follow up even if bleeding stops or pain improves. The early pregnancy scan guide after ectopic pregnancy explains why an uncertain early scan needs a clear follow up plan.

Discuss the device with the treating clinician

Do not pull the threads or attempt removal yourself. If you want to continue a pregnancy inside the uterus, a clinician will discuss removal when the threads are visible or the device can be safely reached. Leaving a coil in place increases risks including miscarriage, infection and premature birth. Removal reduces those risks but does not make them identical to a pregnancy conceived without a coil.

If the threads cannot be safely reached, the team may use ultrasound to locate the device and discuss the options. If you are unsure whether to continue the pregnancy, ask for confidential support with that decision alongside the medical assessment. Before leaving, make sure you know how to get help for new pain, fever, abnormal discharge or heavy bleeding.