Fertility meds?? Clomid? Letrozole?

We have been TTC since April. Nothing has happened yet. Went to the dr and he said I wasn't ovulating but still having periods. For the past few months now I've been on Letrozole (Femara) and it is making me ovulate...but still nothing's happening. And now it's showing my progesterone is lowering, so now we have to deal with that too. Anyone else take it and have any issues or success? I'm getting FRUSTRATED!!!