So im almost on my 4th pack of birth control, my periods have been irregular. My first one when I started the pills was 2 weeks! My second was ten days which ended a week and a half ago. This morning im bleeding again?? How is this possible? Im on the inactive pills and have 3 pills left to take. When i got my period before it was usually during the 2nd or 3rd week. I just want to know whats going on.