Well... I have gotten pregnant twice on femara 2.5mg and with that I have always ovulated late. I miscarried both times. After that my doctor upped my dosage to 5mg and it's always been bfn and I ovulated on day 15 on the dot. My theory is that my follicles are just growing big but the egg is not maturing. So this time I am going back to 2.5mg and going to try. Let's see...fingers crossed!