I have this app to track my ovulation and period and the other app owned by glow which I also have my period tracking on there too.... both say I ovulate different days. Wha? I’m so lost

I’ve had sex every day I *thought* was my fertile window and only skipped two days closer to ovulation.. had sex day before ovulation and am assuming I will be having sex today which is my “ovulation” day according to this app.

BUT.. my nipples have been very sensitive and have darkened A LOT.. like while in the shower (your nipples obviously get hard) they look SOOOOO DARK.. and the last time that happened was when I was pregnant. How could my body change this quickly if according to the app my ovulation hasn’t even happened yet lmao