You could be, but there is a very small chance... When you get your period, it is the lining of your uterus shedding because the egg wasnt fertilized, so basically it is chemically impossible to get your period while pregnant.
I think it can happen in rare occasions, but it isnt common.. If you are still worried, take a home pregnancy test, as you said august was the last time you had sex?
I dont know about the abortion thing, i'd wait until u found out if your really pregnant before worrying about that
by the way,im michelle.. Im 15 and pregnant withmy first child.. Pm me if u need anything:)
goodluck