I'm crazy worried

So about a month ago I had sex with no condom. I'm on the pill but that day I forgot to take my pill until I got home that night. I regret that night so much. I've been stressed out that I'm pregnant. I'm going to take a test tomorrow, and I'm just totally freaking out. I know what to do if I am, and my guy knows I'm worried about being pregnant. I read up on my BC and read that it can actually common that it causes late/early or missed periods so that made me feel a little better. I do know stress can delay my period. I'm having no symtoms of pregnancy. I've had a headache for like 4 days in a row now but I think they're tension headaches cause my necks hurts. Im just worried 🙁