Endometriosis raises the risk of miscarriage by about 51% compared to pregnancies without the condition, with studies showing a miscarriage rate of roughly 15.6% versus 10.4% in the general population. That’s a meaningful increase, but it also means the majority of pregnancies with endometriosis do result in a live birth. While no single intervention guarantees prevention, several evidence-based strategies can improve your odds of carrying a healthy pregnancy to term.
Why Endometriosis Increases Miscarriage Risk
Endometriosis creates a chronic inflammatory environment throughout the pelvis and uterine lining. This inflammation disrupts the conditions an embryo needs to implant and grow. The uterine lining in women with endometriosis often shows higher concentrations of certain immune cells (natural killer cells) that are also elevated in women with recurrent miscarriage, suggesting the immune system may be overreacting at the implantation site.
Oxidative stress, an imbalance between harmful molecules and the body’s ability to neutralize them, also plays a role. This oxidative damage can affect the DNA in eggs and embryos, promote embryo fragmentation, and interfere with the placenta forming properly. On top of that, many women with endometriosis have some degree of progesterone resistance, meaning the uterine lining doesn’t respond as effectively to the hormone that sustains early pregnancy. These overlapping hormonal, metabolic, and inflammatory factors all contribute to a higher chance of pregnancy loss.
Surgery Before Conception
Laparoscopic surgery to remove endometriosis lesions is one of the most discussed interventions for improving fertility. European guidelines from ESHRE recommend it as a treatment option for endometriosis-related infertility in mild to moderate cases, noting it can improve rates of ongoing pregnancy through natural conception.
The evidence on whether surgery specifically prevents miscarriage is less clear-cut. A recent meta-analysis found that surgery before IVF did not significantly change the early pregnancy loss rate. In some small studies, no pregnancy losses occurred in either surgical or non-surgical groups, making it hard to draw firm conclusions. Surgery does appear to help with getting pregnant in the first place, particularly for women with pain symptoms or visible endometriomas on the ovaries, but it hasn’t been proven to lower miscarriage rates once conception occurs.
The decision to have surgery should factor in your age, pain levels, ovarian reserve (how many eggs you have left), history of previous surgeries, and whether other infertility factors are present. Repeated ovarian surgery can reduce egg supply, so this isn’t a step to take without careful planning with your reproductive specialist.
Progesterone Support in Early Pregnancy
Because progesterone resistance is a core problem in endometriosis, supplemental progesterone is commonly used to support the uterine lining during early pregnancy, especially in IVF cycles. Research on endometriosis patients undergoing frozen embryo transfers has shown that higher progesterone levels during the transfer window improve outcomes. In these protocols, vaginal progesterone is typically started once the uterine lining reaches adequate thickness, sometimes combined with an additional form of progesterone to ensure levels stay high enough.
If you’re conceiving naturally, talk to your doctor about progesterone supplementation in the first trimester. It’s widely used for women with a history of miscarriage or known luteal phase deficiency (when your body doesn’t produce enough progesterone after ovulation). For endometriosis patients, the rationale is especially strong given the biological resistance to progesterone that the condition creates.
Reducing Inflammation Through Diet
A Mediterranean-style anti-inflammatory diet is currently being studied in a clinical trial specifically for women with endometriosis undergoing IVF, with miscarriage rate as one of the outcomes being measured. A six-month trial of this dietary pattern already showed improvements in metabolic markers, oxidative stress levels, and quality of life in endometriosis patients.
The practical guidelines from the trial protocol offer a useful framework. The diet emphasizes extra virgin olive oil as your primary cooking fat (at least four tablespoons daily), at least two servings each of fresh fruit and vegetables per day, whole grains, nuts, and fish rich in omega-3 fatty acids at least twice a week. Red meat is limited to no more than twice a month. Ultra-processed foods, sweetened beverages, refined oils, and trans fats are avoided entirely. Anti-inflammatory spices like ginger, garlic, and turmeric are encouraged.
The logic is straightforward: nutrients like magnesium, vitamins A, C, D, and E, flavonoids, fiber, and omega-3 fats score as anti-inflammatory, while saturated fats, refined carbohydrates, and high overall calorie intake score as pro-inflammatory. Shifting the balance toward anti-inflammatory foods may help counteract the chronic inflammation driving endometriosis and its effects on pregnancy.
Antioxidant Supplements
N-acetylcysteine (NAC), a powerful antioxidant, has shown promising results for endometriosis and fertility. In a study of 120 women with endometriosis, 75% of those who wanted to conceive achieved a spontaneous pregnancy within six months of starting NAC therapy. The supplement works by neutralizing the oxidative stress that damages eggs, embryos, and the early placenta. While this study focused on achieving pregnancy rather than preventing miscarriage specifically, reducing oxidative damage at the cellular level addresses one of the key mechanisms behind pregnancy loss in endometriosis.
Other antioxidants and supplements frequently discussed in this context include vitamin D, omega-3 fatty acids, and vitamin E. These overlap with the anti-inflammatory dietary approach and may offer additional benefit when dietary intake alone is insufficient. No large trial has yet proven that any single supplement prevents miscarriage in endometriosis, but the biological rationale is strong enough that many reproductive specialists include them as part of a preconception plan.
What Early Pregnancy Monitoring Looks Like
You might expect that endometriosis would call for extra ultrasounds or blood tests during the first trimester. A systematic review published in Human Reproduction Update found that current evidence does not support any modification of standard pregnancy monitoring for women with endometriosis. Complications from endometriosis during pregnancy are unpredictable, and no specific additional interventions have been shown to help. If an existing endometrioma (ovarian cyst from endometriosis) is present, the general recommendation is to monitor it rather than operate unless it causes an acute problem like torsion or rupture.
That said, many reproductive endocrinologists will schedule early ultrasounds around six to seven weeks to confirm a heartbeat and proper implantation location, particularly because endometriosis more than doubles the risk of ectopic pregnancy (3.5% versus 1.5%). This early confirmation can catch an ectopic pregnancy before it becomes dangerous and provide reassurance when the pregnancy is progressing normally.
Putting It Together Before You Conceive
The most effective approach combines several strategies rather than relying on any one. Starting an anti-inflammatory diet and antioxidant supplementation three to six months before trying to conceive gives your body time to reduce systemic inflammation and improve egg quality. If you have significant pain or visible endometriomas, discussing surgical options with a specialist who understands the tradeoffs with ovarian reserve is worthwhile, ideally well before you start trying.
Once you conceive, early progesterone support and confirmation of proper implantation through an early ultrasound address the two biggest early risks: inadequate hormonal support for the uterine lining and ectopic pregnancy. If you’re not ready to conceive immediately after any surgery, hormonal therapy in the interim won’t harm your future fertility and can manage symptoms while you prepare. These steps won’t eliminate the increased risk entirely, but they target the specific inflammatory, hormonal, and oxidative pathways that make endometriosis pregnancies more vulnerable.