We had unexplained infertility, NOTHING wrong with either of us, great sperm, clear tubes, no premature menopause, no immune problems nothing. But 7 IUI's and an unsuccessful IVF later, the RE said that he couldn't do much else for us and we could keep trying but it could be tomorrow or never. He said it is most likely a problem with implantation but they didn't have enough research into that yet.
Anyway I decided to use my one and only frozen embryo and then look into Chinese medicine instead and guess what.....22 mionths of trying and we got pregnant!
Never give up................