12dpo, period expected tomorrow, neg HPT

Livi 🦊
I'm 12dpo and I swear I keep seeing a line on my test but when I revisit it it isn't there. So I keep getting negatives. AF due tomorrow but there is no sign of her coming. Has anyone tested 12dpo and got a negative only to find that they WERE pregnant? This waiting game is driving me crazy. I can't stop POAS.