Me and my fiance has been having unprotected sex 3 weeks now but the second week my period started early but we was still having sex and the last 4 days the blood for really light like pink color and then the 2 day before it was supposed to end it stopped I have a period for 7 days 3 day was normal and on day 4 it got light pink then on day 6 it stopped which isn't normal for me could I be pregnant???