Pregnancy scare

My ovulation window started from November 30th up until December 6th. I had unprotected sex December 1st & 7th. Used pullout method during both times. I missed my period in December due to stress, which should have came December 20th. I still have slight cramps here and there. As of today I still have no period. Is there a chance I can be pregnant? Or maybe I’m just over thinking?