Pregnancy question

Nurse Anais • I am a registered nurse in Melbourne, Australia! Both parents are Doctors, so ask away! I have a 2 year old daughter!
My boyfriend and I had unprotected sex, then the next day I was on my period. Is there a chance that I could be pregnant at all? It's been a few weeks & I'm having some weird tugging feeling in my ovaries. Can anyone help me out?