1 day period?! 🤔😅

I've been having periods for 4 years now, and they're pretty regular (usually last 7 days, normally heavy flow). But last week, when my period was due, I only had it on the start date. It was HELLA heavy and I was sick AF 😷 (I passed out at school). And it's been a week and I wore pads for the remainder days just in case, but no return of blood. This probably sounds like a dream, but I'm kinda concerned. (Not sexually active). Any help?