Aimze- I know my sister has done some hormone tests, and her DH has been tested for sperm count/motility. Both of them came back completely normal. I think she might have an upcoming test for Endo. But she has totally regular cycles, always gets positive OPKs...she is 32. It really is a mystery that she's never been pregnant, not even a mc. The only thing her Dr told her is that she apparently has a severely tilted uterus.
I'll pass on any tips you have for her!