i doubt it your period came so that is a sure sign that you are not pregnant if worried take a test to settle your mind xx
if you are on your period then you are most likely not pregnant. However to prevent pregnancy in the future you should consider going on birth control.
You are fine... if your period started (around the time it should) then you are not pregnant.
No seeing as you had sex last thursday and last night and started your periods today it's unlikely that you are.