Period on birth control

I’m on the patch and usually my period starts on a Wednesday/Thursday and I bleed until Sunday. Sunday I put my patch on and it basically stops.

I wanna say I started Wednesday night/Thursday morning and today (Friday) my period is not a period. It looks like I’m not even bleeding a tablespoon today. The color is a brownish color like I’m about to get off my period and it’s just old blood. My last period I was cramping so bad and this time around my cramps were yesterday and I’ve not been cramping today. Me and my BF did have sex November 1st & the 13th morning and night. My fertile window (as if I wasn’t on the patch) prediction was the 30th of October to November 4th

Has this happened to anyone else or is it just me? Cause I’m barely bleeding on a Friday and usually my periods are more than what it is now…& the passed couple days I’ve been getting heart burn but it goes away.