could i be pregnant? HELP

sorry i just get really paranoid when it comes to being late with my period lmaooo. but i had sex on december 14th and i had my period on december 28th. before my period i drink lots of ginger tea because i had a cold. during my period i barely got any cramps at all. now i’m just wondering if that “getting pregnant even during or after your period” is happening to me. i feel like i’m going to get my period, i keep getting headaches and getting mad easily and all of the PMS symptoms. could it be possible guys?