Help 13dpo bleeding but not alot!

Jess

Hey guys so I woke up and I was like oh shit I got my period, it was heavy and I had some cramps. I wasn't supposed get my period for 2 days, so I was alittle confused it was early. Anyway I'm not really bleeding anymore and usually the first day of my period is HEAVY and awful. Weird! Has this happened to anyone?