HI there,
I undertand how frustrating it can be TTC month after month, getting our hopes up only to have them come crashing down when AF arrives. With me and my DH there are actually problems on both sides, I have PCOS, however wa unable to conceive even when on clomid. It wasn't until DH was tested that we found that 97% of his sperm were abnormal in head shape so that even if there was an egg, the sperm couldn't get inside. My point is, it could actually be an issue from your DH's side rather than yours. It wasn't until DH had an indepth analysis of his sperm that we found this out (prior to doing IVF ICSI). I think it was a relief to find out (Finally) what was wrong and that there was something we could do about it. ICSI i where the sperm is injected into the egg - we have had ICSI on 2 occasions and fell pregnant first go on each, this was after 6 years of unsuccessful TTC. Definately go and get checked out, just to ensure that there is not some issue that is preventing you from conceiving, at leat you will know where you stand and can get advice on where to go next.
Goodluck