what to do?

So I'm late for my period by 10 days, and I've taken two pregnancy tests(from the pound shop but people say they work the same) and they both said negatives. I've been having really swore period pains like above my crotch. My family has told me it may be stress because I'm stressed wether to neck out university or leave as I don't really want to do it. But my best friend said she thinks it's cause of the pill, I've been on the pill for 2 years and I've never gone for those check ups because my doctors are crap and getting an appointment for something serious is impossible let alone a check up 🙄 so anyway I stopped taking the pill completely last month and me and my boyfriend have just been using condoms so, I'm not really sure what's happening with my body