Late by 4 days and bfn last night

I realized I was 3 days late last night. Took a test just to see and figured it would be a bfn. I have no premenstrual symptoms which is weird. Normally like a week before my period I have all these cravings sore breasts, bloating, nausea and fatigue. So what gives? My cycle get all wonky on me? I'm haven't been stressed about nothing, not even ttc. I've just feel kinda meh. Like okay, I'm not pregnant so now what? If I'm skipping a cycle, that's fine. But even the last time I skipped i had pms for the whole next month.