I've been on Yaz for a few of months now. After I finished my first pack, I had a normal period, but then had a light bleeding for about two weeks after my regular period. My doctor said this was expected so I wasn't worried. This month, I had surgery and missed a few pills, and this happened again. I've never had sex without using a condom, so I ruled out the possibility of pregnancy or a miss carriage. Anyone know what's going on?