I know of someone who took 5 cycles of Clomid before conceiving. I conceived after 2, but have sadly suffered a MMC.
My understanding is that clomid should not be taken without a break after three months, and then only taken for a further three months. If no success after that, from what I have read people are generally advised to move on to IUI, IVF etc, as clomid is unlikely to bring success after this point and there is a danger of the womb lining starting to thin etc.
I have been ttc for 7 years now..just found out I have PCOS which is whats causing me not to ovulate. I did take Clomid a few times about 2 years ago and it never worked for me..the only thing it did was make me bleed horribly bad! Dont know why?