Please help

(First day of my period nov 1)Had unprotected sex like 6+ times the month of November; on nov 28 had one night stand which was protected but in back of my head am still scared.. i tested a strong positive dec 3 (my prd was due dec 2) which is 5 days after that one night stand... was I pregnant already?? Am currently 10weeks 2 days based on my LMP

This is killing me inside