Temperature before period

So AF should arrive tomorrow. I took a test yesterday with a BFN the past two days (and especially at night) I’ve been EXTREMELY hot. I’ve taken my temp (regular thermometer) and have been running between 99.3-99.7. It’s not a cold/fever. Is this a sign of pregnancy or a sign of AF??? Also why can’t symptoms just be clear cut. This is why men think we are crazy 🤣🤣🤣🤣