Hiya, I Had A Period Around The 13th Of Dec,

Hiya, i had a period around the 13th of dec, then on the 3rd jan i had unprotected sex with my partner but i also had the pink tint blood nothing more then the 4th i bleed quiet heavy alday then the 5th it had completley stoppted, was that still my period? Also i have done a pregancy test yesterday the 10th but its negative but im gettin those pulling pains in my pelvis a pregancy wud be wicked but im usesure as the bleed lastweek as thru me