Its been 6 days after i had unprotected sex and im wondering could the light period like cramp pains near my uterus be due to my upcoming period in 5?

Possibly. : Though there are multiple possible explanations, pregnancy in a female your age is the most likely. Sometimes women have spotting that occurs as the fertilized egg implants known as "implantation bleeding" send can sometimes be mistaken for a period. Mild cramping pain can be also present. If you develop very severe pain don't hesitate to be seen in the ER. Ectopic (tubal)pregnancy is an emergency