What is the connection between endometriosis and pregnancy loss?

Don't know for sure. No good evidence yet that endometriosis is a cause of recurrent miscarriage (2 or more losses). Endo. May affect embryo implantation, which affects getting pregnant not staying pregnant. Auto-immune antibodies (antiphospholipid antibodies or apa) are more common in women with endometriosis even with no losses. Apa cause some cases of recurrent miscarriage. Need big studies to find if linked or not.
Not sure. However, recent evidence shows that endometriosis is caused by disruption in the hormones and immune system that helps the endometrial cells to stick and thrive in the proper location were the embryo attaches in early pregnancy.