Help please!!!!

So im pretty certain I'm not pregnant. Like 105% sure that I'm not. But I had a weird period last month, and my cycle has been off since I started having sex. Like the first time I had sex, I had just gotten off my period, but then it came again two weeks later and that's never happened. And now the cycles seem to be longer. But lately, since like Saturday, everyday I have a symptom. Saturday my ovaries were hurting, and then my nipples started hurting, and then I was gettin bloated, and I've been excessively hungry. Like I could eat, and then I want to eat again. Today, I got a stomach cramp out of nowhere and never got another one. <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> estimates that my period should be here next week, so could this be PMS? Just really early?