crazy periods 🙄

Elizabeth
I have been having long cycles (50-70 days), I always have exactly the same length of bleed time (3 days), but sometimes I don't bleed at all while still having cramps or PMS symptoms. What the hell is going on?? 
Not pregnant, so at least that's a relief. I'm a lesbian so that isn't possibility. 
I never really cared enough to pursue this because less periods in the year was ok by me, but now since I've tried to start tracking, it has become annoying. <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> can't make any sense of what's going on. 
Anyone else had these symptoms?Â