I am 29 years old and I've always since I started birth control had irregular periods and the pill just doesn't seem to agree with me, but I still take it. In the beginning of the year I switched to generic yaz and i was getting my period for 2 weeks instead of one. Well now I get period symptoms and no blood. I'm really scared that I might not be able to get pregnant again. My husband and I would like to start trying again soon. What would be reasons for no blood?