My period last until 3-4 days. i had unprotected sex he ejaculate inside me. few hours later i had my first day of period. chances of getting pregnant?

Always possible: Anytime there is sexual intercourse , and especially when there is ejaculation in the vaginal , there is a chance of becoming pregnant. How high? Hard to tell you that, but if you want to avoid pregnancy then there is only one sure way: abstinence.

Low: If you had your period you should be ok. Check a pregnancy test in a week to be sure.

Low: You are at prime time to get pregnant midway between periods. If you miss your next period do a pregnancy test. Also use birth control if you do not want to get pregnant.