I too had Endometriosis that caused (well, my doc seemed to think) 2 miscarriages and an ectopic, but after laparoscopy surgery to remove the endo and adhesions from both tubes I had a healthy pregnancy. Have you thought about surgery?
I have endo and I too have had a couple of mc. I was diagnosed about 10 yrs ago. My first pregnancy a couple years later was ended in early mc. Then,4 yrs later I was able to get pregnant again and now have a wonderful 2 1/2 yr old. I had another mc after him. After a year of trying again we went to an RE and found that my dh has low cound and low morphology. We were able to do IUI and it was successful. I am now 17 wks pregnant. I was told it didn't have anything to do with the endometriosis. I would see an RE but the fact that you are getting pregnant fairly easily is a great first step!!!