ME and my boyfriend had unprotected sex, I was on my second day of my period and as usual, heavy but on time. Now, day after sex I'm not on my period anymore, should I be worried?

You could already be worried, since stress can effect your period.

But yes of course you could get pregnant,

I actually had a friend who was three months pregnant, and had her period normally for those months. I guess sometimes your period isn't an indication. Be careful and get tested.