I've been on the birth control pill YAZ for 3 months and had unprotected sex 2 weeks ago (he pulled out) I also take my pills regularly and don't miss any days and according to my pack of pills my period should have started yesterday (I have 4 white pills and the rest are red) and I've had light cramps and very very light bleeding barely even noticeable if I didn't pay close attention. Am I pregnant? Is the bleeding implantation bleeding help!