I have endo and have gone through a lapro as well as 6 months on lupron. I am currently trying to get pregnant. They came up with Endo. Usually there is something inherently wrong with the egg and sperm mixing together. I had laproscopic surgery about 4 years ago and my Dr. did'nt follow up with the depo shots.
Some use depo post operatively, some use birth control pills, some just wait and see.
If your surgery was four years ago , and you haven't had any problems up to this point, then you're doing quite well. Glad I could help. Vitamin supplements and exercise have really helped me. In the search for reasons, they found it and removed it. You should always be taking at least 400 micrograms of folic acid prior to conceiving a pregnancy to help prevent birth defects.