I started BC on July 14, 2015 and the last time I had my period was June 29, 2015. Before I started on BC I was very irregular. I've has sex when I was on BC and was always on time. After I stopped having sex I messed up on the pill a couple times. I've heard that you get your period every 90 days and periods could delay when you mess up on the pill. I'm just wondering if I'm pregnant or not.