My period cam on the normal day, and it was heavy the first day, but the secon day it was like I was only spotting, and not on the third day I'm just spotting. Could I possibly be pregnant, because my period is never like this?

NOT getting your period is the #1 sign you are pregnant. A heavy period is not a sign.

Many things can affect your period, including stress.

I'd see what next month brings.