Your OBGYN is right. Mine also had me use
Femara for 4 cycles to try to increase our chances since I am in the dreaded "unexplained" category. It worked great for me, I O'd consistently, and had minimal side effects (just headaches and hot flashes here and there). We didn't end up with our BFP, but I have seen a lot of women who have with the Femara. Here are two information packets on it.