Can a woman become pregnant after having an intrauterine device (IUD) inserted?

Intrauterine device (IUD) insertion is currently one of the most commonly chosen contraceptive methods among women, as it offers long-lasting effectiveness and generally does not impair the quality of marital sexual life. However, contraceptive efficacy remains a primary concern for many individuals. So, can a woman become pregnant after IUD insertion? Let’s explore this question below.

Can a woman become pregnant after IUD insertion?

Yes, pregnancy can still occur after IUD insertion. For instance, inappropriate device sizing—such as selecting an IUD that is too small for a relatively large uterus—may lead to device displacement or expulsion, thereby compromising its contraceptive effect. Similarly, incorrect placement—such as failing to position the IUD at the fundus (topmost part) of the uterus—also renders it ineffective. Furthermore, engaging in squatting physical labor or sexual intercourse shortly after insertion may cause IUD displacement or expulsion, resulting in contraceptive failure. Additionally, women with diabetes and persistently elevated blood glucose levels experience increased bodily fluid acidity, which may corrode metal IUDs and impair their contraceptive function.

Knowledge Expansion: Causes of Pregnancy After IUD Insertion

1. Expiration of recommended usage duration

Stainless steel IUDs may remain in place for approximately 20 years and should be removed within six months after menopause; plastic or silicone rubber IUDs are typically effective for 3–5 years; hybrid plastic-metal IUDs for 5–10 years; copper-bearing IUDs for 3–5 years; and copper-sleeve IUDs (replacing stainless steel wire with copper tubing) for 10–15 years. Failure to replace or remove an expired IUD may result in unintended pregnancy.

2. Incorrect positioning

If the IUD is not placed at the uterine fundus but instead positioned near the cervical os, its contraceptive efficacy will be significantly reduced—or even completely lost—leading to unintended pregnancy. Moreover, elevated blood glucose levels increase bodily fluid acidity; acidic fluids may corrode metal IUDs, thereby diminishing contraceptive effectiveness and increasing pregnancy risk.

3. Inappropriate IUD selection

Purely metallic IUDs or those made from softer materials are more prone to expulsion, whereas “core-type” IUDs (containing a rigid central stem) demonstrate greater stability. Therefore, when selecting an IUD, clinicians should prefer core-type, non-purely-metallic, or non-metallic devices with firmer structural integrity. Additionally, the IUD size must match the individual’s uterine dimensions; otherwise, displacement or expulsion may occur, rendering the device ineffective.

The above outlines key considerations regarding the possibility of pregnancy following IUD insertion. We hope this information proves helpful to you.