I need some words of wisdom...

My boyfriend and I have been dating for a couple years now. Please, dont judge...Two days ago we were about to have sex for the first time. He had a condom on of course and I was on my 4th day of my period. It got to the point where he only had a little bit in and about a minute or 2 later we stopped cause we knew it wasn't the right timing in our lives. We're both off to our first year of college. I'm worried now though. Since then my period has lightened up and today (my 6th day) there's hardly anything except a little blood and whenever I wipe. Could I be pregnant?? or is it normal for your period to lighten up afterwards?