Am I just freaking out?

I missed my pill on a Friday and had unprotected sex the following Monday. Should I be worried about being pregnant? I usually take my pill at night and when I woke up the next morning and I realized I forgot it I took the pill, that night I took another pill to get it back on track and haven't missed one since. The guy didn't cum inside of me but there still is precum and all that other jazz. I've been tired and getting head aches lately. I don't know if I'm just scared and over thinking everything or what. I guess the real test will be if my period comes or not.