I have been on birth control for nearly 4 years now. Last July I switched to a new birth control and was fine, but had problems. So two months ago I switched to a pill that had 7 placebo pills. I still had problems with that one so they switched me back to the 4 day placebo pills I was on last July. I had crazy 10 day bleeding from the last birth control and started my new one during it to fix it, and then I had some random bleeding in the middle of my pack. I’m not sexually active, so I don’t know why on the 3rd day of 4 placebo pills, I still haven’t started my period. Could something serious be wrong?