If i had unprotected sex three days after my period am i likely to get pregnant?

Am I pregnant: This is unlikely to have caused pregnancy. But, that is dependent on if your period was on time and was of a length that is normal for you. You are most likely to be fertile in the middle of your regular menstrual cycles.

No : First, \it is important to know if it is 3 days after d1 of your cycle, so always speak in terms of d1 being the first day you have any bleeding. Ovulation occurs 11 to 14 days before your menses arrives. So if it is 3 days after the start of your cycle you are unlikely to become pregnant unless you only have 17 days from the start of one cycle until the start of another.

Very unlikely: 28 day cycles with a period less than 7 days its highly unlikely you would ovulate at this time.