Help!!!

I had sex on 12/8, I've been taking the combo pill, Sprintec to be exact, every day but some days I would take it 2-3 hours difference from. I never missed a day. On the day I had sex, I took generic plan B 8 hours after. Since then, I've been feeling nauseous and a bit sensitive to smells, as well as bloated in my lower belly. Please know also that I have a lot of anxiety and really am nervous about getting pregnant and do not want kids!!! I took 2 pregnancy tests today, one clear blue and one dollar store test. Both were negative, but my period is not due for another week. Please advise!!!