Please help. So confused

Felicia

So long story short

I had my period Aug 12-17 and this app says my most fertile days are today through the 2nd.

I’ve been taking ovulation strips here and there and they looked almost positive several days in a row last week but now are 100% negative. It never got super dark. We did have sex on some of those days but I’m at a loss since it was supposed to be this week.