I went through a lot of infertility problems too. I am a cah carrier. My problem was called a "luteal phase defect", meaning my progesterone levels were off. I went through several years before they figured this out.... I was on all sorts of infertility drugs, and numerous artifical inseminations. But one month with progestreone supositories and I was pregnant! (I am tired and none of these words look spelled correctly.... sorry) My precious cah daughter is the reslut of this pregnancy. To find out this problem the dr had to take a sample of my endrometrial lining of the uterus. It was quite painful to me, but well worth the pain. The test has to be timed exactly on your cycle. Be sure you have this test, the cure is so simple.