Confused 🤷🏼‍♀️ ?

According to glow AF is due 7/25 and I should have ovulated 7/11 and cervical mucous was in line with that date.. I took a FRER this morning (I know too early) and it was negative. Then just because I am inpatient I took a OPK and saw a vvvfl! What could be going on?