i have endo, but my uterus is where it's supposed to be. have you had a laparoscopy to see if it's tipped from adhesions? often endometriosis can cause scar tissue and adhesions that look like cobwebs and bind organs together. they can pull your uterus and ovaries into different positions. i'm one of the lucky ones with no adhesions even after a few surgeries (surgery can cause adhesions too).
i don't know if a tipped uterus would affect fertility though. a lot of women have them.
good luck.