I recently had rough sex and i started bleeding afterward. it was light flow and then heavy flow hours later. my period came on, it is a week early.

Consensual, right?: As long as it was consensual, then no worries. But if you didn't agree, then it becomes a legal issue ie rape. Post-coital bleeding is common but shouldn't be ignored. You need to get evaluated by your Family Doc, GYN, Planned Parenthood or local city/county STD clinic. Once we're sure you don't have infection or anything else, then we can blame it on enthusiastic sex. But not until exam & tests.