Clomid vs femara?

Kj

I did 2 rounds of clomid, no luck. I am now going to try femara. Do I have better chances with femara? In November I didnt ovulate on my own in December (first round of clomid) progesterone was 7 and since I took clomid they wanted at least to be a 10, in January I didnt do blood work (stupid me. This month I will try femara on a low dose. Any suggestions, anything different, side affect between the 2?