Hi I'm having a bit of trouble. My period is late by 10 days. Now before jumping to conclusions.. I'm 17 years old and have a past of very heavy very irregular period. I bled for a month and a half when I was 13, and had been taking birth control from summer of 2013- summer of 2016. I wasn't very good at taking the birth control, but periods stayed regular at that point. My doctors stopped sending my prescription around august so I stopped taking it. My last 2 persuades both happened in september. 1 in the first week and the other in the last week. My last one ended October 2nd and I had protected sex October 3rd. Everything went smoothly and there weren't any complications. Condom was intact and there weren't any slip ups. What could be causing it to be this late?