Scared i'm pregnant...?

Last time i had a period was the last week of nov. I had unprotected on dec 8th (condom was on, but came off, finished with it off, but he didnt m in me) I did two early detection pg tests this week, both were negative. I ume i am probably fine, I'm feeling menstrual cramps (but i've read these can be pg cramps now). I have had pms symtoms, but of course no period yet. My stomach feels weird, but i definitely felt menstrual cramps the past two days but now period. Really annoying! Do you think i'm pregnant or not? What a lovely thing to worry about around the holidays