Apparently I’m 70 days late?

My period was always irregular from the moment it started. My GYN gave me some medicine and it fixed the problem. That was 2 (almost 3) years ago. But now, I haven’t had a period in 70 days. At first, I thought it was stress because I have a lot going on. Then I thought I was pregnant, because I *was* hooking up with my ex-boyfriend. But I took many tests, and they were all negative. I got tested from Hep-A to Zika and everything was negative. Btw, I don’t take birth control. So wtf is going on with me? Has anyone been through the same?