first day of my last period was the 23 of Aug 2012, had intercourse yesterday and i notice i ve been spotting blood from 3am this morning and around 7am when i woke up, the blood is from light red to kinda pink, I have a fluttering feeling in my stomach and i feel so tired and thirsty all the time, i kinda have the same feeling like when i m having my period! could this mean I m pregnant?