OTC Fertility Pills?

have any of you ever tried an over-the-counter fertility pill? I am 37 and just had my tubal ligation reversed in August. my husband and I have been trying to conceive ever since. AF has always been like clockwork and now all of a sudden she is non-existent this month. I've taken several tests and they are all negative I have no symptoms so I know I'm not pregnant. I'm just curious if anybody has ever tried using some of the over-the-counter fertility assistance pills? if so what type would you suggest. thank you in advance impatiently waiting for a baby