AF one week apart??

Hi guys! This might be a stupid question, but here’s my situation:

AF just left me on August 29th. Glow says I’m supposed to ovulate September 4th. On the 4th, I have some light spotting that carries on to the 5th. I chalked it up to ovulation bleeding because I read that can happen... cue this morning and it’s like that scene from Carrie!! AF is here and in full force (cramps, heavy bleeding, etc)... just over a week from when my period ended. Any idea what’s happening? Husband and I have been TTC and this has never happened to me before.