worried 😫

I slept with a guy on NYE and now I'm panicking because my period was supposed to start today and hasn't, and I'm not really feeling any of my normal period symptoms. I used protection, but I'm always hearing horror stories about it failing, and I don't take BC. I'm so worried about pregnancy, I'm nauseous and can't sleep. I'm just not sure what to do or how to react. I do not want children and cannot afford an abortion. Also, the fact that I deal with moderate/severe clinical anxiety isn't helping.