I have been on birth control for a while but I forgot to take a pill one night. The next day I woke up with blood and realized what had happen so I took the pill but I kept bleeding for 5 days before my sugar pill so I ended up being on my period for 12 days.. My periods are usually 4 days.. Once I ended, I took my pills for normally for the next 21 days but now I completely skipped my next period even though I took sugar pills.. Is this normal? Is my body skipping thus period because of how long my last period was?