Why is my period being so weird?

Amanda

It’s always been regular. I always knew when to expect my period. But ever since I started being sexually active again, my period has been super irregular. It came 2 weeks early, twice in a row. And it’s extremely heavy. I bled completely through 3 tampons in 8 hours, where normally 3 tampons does the job for me. What are some reasons this could be happening?