I had unprotected sex with my boyfriend and within 5 hours after sex I took an I-pill tablet, now I'm going through my periods and its second day, problem is that bleeding is not as much heavy as usually it was on first and second day, m I pregnant...

No, you probably are not - probably is the "magical" word. Only time will tell.

I would suggest that if you are not pregnant you look into forms of birth control and pick whichever would work best for you.