Help!! Period has gotten heavier!

Ever since I've gotten to college, I've noticed that my period has gotten kind of heavier. I think it's because I used to dance regularly when I was at home, but lately I haven't had time because I'm so packed with work that I haven't been doing that very much. So could it be because I haven't been exercising like I was before? It's really annoying for me because now at night I'm like leaking through my pads and getting it all over my underwear and pants....which never used to happen before. And the flow is pretty heavy during the day too. What can I do for this??