Another pregnancy test

I took a PT yesterday that was a BFN ! my boyfriend didn't believe the test because I purchased it at the dollar store. Anyway , I went and purchased another test ( a different  brand ) today that was a BFN ! Ok I'm a little sad because I've been TTC for months. Anyway , I have an appointment at the clinic tomorrow to take another PT! I'm hoping that it's a BFP , even though I'm thinking it'll be another BFN! All I'm thinking is , if I'm not pregnant than , Where are you AF ? Please come down lol because I'm tired of stressing about being pregnant yet no period :(