Hi Doctor,i M Stl A Virgin, On D 17th Of

Hi Doctor,i m stl a virgin, on d 17th of nov my boyfriend nd i were playin around naked,nd he ended up releasing his sperm on me. I had my period 3days after that was on d 20th of nov,buh i m stl scared dt i m pregnant cus i'm having abdominal pain..is it possible for a virgin to be pregnant? its jst a week dat d incident occurred but i m scared,pls advice me on it,nd what pills can i use for termination incase i appear pregnant..thanks in anticipation