Had my period for 2 years now and it's ALWAYS been irregular. So it came 2 weeks early. It also didn't last as long. I also didn't get as bad cramps as I normally do. So a week later (today) I started getting period like cramps and noticed that i got the brown discharge I get when my period is about to start. I'm really scared. I haven't had sex but I've done other sexual activities. E.g mutual masturbation and dry humping. What could this be??