Endometriosis and Miscarriage: What Research Suggests

In general, some forms of postpartum hormonal suppression can be compatible with breastfeeding, but “safe” depends on which medication you mean and what your goals are (pain control, bleeding control, contraception, or all three). Progestin-only options and the levonorgestrel hormonal IUD are commonly used postpartum because they can reduce bleeding and cramping for many patients without the deep, whole-body estrogen suppression that can come with stronger agents.

We’re more cautious with medications designed to drastically lower estrogen (like GnRH agonists/antagonists), because profound estrogen suppression can carry meaningful side effects and isn’t a long-term solution for endometriosis—it may quiet symptoms without treating disease. If you’re breastfeeding and also dealing with suspected endometriosis or adenomyosis symptoms returning postpartum, our team can help you weigh symptom relief, lactation goals, side-effect risk, and the bigger plan for getting to a lasting diagnosis and treatment pathway.

If you tell us what you’re considering (pill vs shot vs implant vs IUD, and whether you’re exclusively breastfeeding), we can guide you toward options that fit this season—while keeping the focus on long-term relief rather than temporary suppression.

Fertility can return surprisingly soon after birth—even if you have endometriosis—because ovulation often happens before your first postpartum period. The biggest drivers of when you become fertile again are breastfeeding patterns, how quickly your cycles restart, and whether you’re using hormonal suppression postpartum (which can also be used to help keep endometriosis symptoms quieter).

With exclusive, frequent breastfeeding, many people have a longer stretch without ovulation, but this isn’t reliable contraception and fertility can still return earlier than expected. If your periods come back, that’s a strong sign your ovaries are active again—though you can ovulate before the first bleed. If you’re trying to conceive again or, just as importantly, trying to avoid an unplanned pregnancy while managing endometriosis symptoms, our team can help you map a postpartum plan that fits your goals and minimizes flares.

Adenomyosis can be associated with fertility challenges, and for some patients it may contribute to very early pregnancy loss (often called a chemical pregnancy). While we can’t say adenomyosis is the only—or even the most common—cause of a chemical pregnancy, it can change the uterine environment in ways that may interfere with implantation and early embryo development, including increased inflammation within the uterine muscle and altered uterine contractions.

It’s also common for adenomyosis to overlap with endometriosis, and that overlap can add additional factors that may affect implantation and early pregnancy. If you’re experiencing recurrent chemical pregnancies—especially alongside heavy bleeding, painful periods, or pelvic pain—our team can help you evaluate whether adenomyosis (and/or endometriosis) may be part of the picture and what uterus-sparing options might make sense for your goals. You can explore more on our site or reach out to schedule a consultation so we can review your history and imaging and map out next steps.

After two miscarriages, our goal is to look beyond a single “endo explanation” and map out all the factors that can affect implantation and early placental development. We start by reviewing your full history in detail (loss timing, symptoms, prior imaging, surgeries, cycle patterns, and any fertility treatments), because the pattern of your losses often guides what to test first. We typically include expertly interpreted pelvic imaging—often ultrasound and, when helpful, MRI—to look for endometriosis features (like endometriomas), adenomyosis, uterine shape issues, and other pelvic conditions that can coexist with endo.

Because endometriosis can overlap with immune, inflammatory, and hormonal drivers, we may also evaluate thyroid function and other endocrine factors, and consider autoimmune overlap when symptoms or history point that way. If your symptom picture suggests contributors outside the uterus and ovaries, we may broaden the workup to related conditions that can worsen inflammation or pelvic dysfunction, rather than stopping at a standard checklist. If you’d like, you can reach out to schedule a consultation so our team can tailor a miscarriage evaluation plan to your history and goals—and help you understand which findings are most actionable for your next steps.

Yes—endometriosis may be associated with a higher risk of miscarriage, although it does not mean miscarriage is inevitable. Many people with endometriosis conceive and go on to have healthy pregnancies, but research suggests pregnancy outcomes can be affected in some patients, especially depending on the subtype, severity, and overall inflammatory burden.

We think the connection is likely multifactorial. Endometriosis is associated with chronic inflammation and changes in the pelvic and uterine environment, which may interfere with implantation or early placental development in some cases; hormonal and immune factors may also play a role. If you’ve experienced a loss (or recurrent losses) and have known or suspected endometriosis, our team can help evaluate the full picture and discuss whether a surgical diagnosis and excision approach makes sense as part of a fertility-focused plan.