Sex during expected date of period

Hi. My partner and I had unprotected sex last May 2-3 and pasok lahat 3x (yun yung dates na expected period ko) pero ngayon May 17 na hindi pa din ako dinadatnan. Possible ba na buntis ako? Regular ang mens ko, iba iba lang ng duration. Minsan 3-5 days minsan 2 weeks pero laging same yung date mag start. #pleasehelp