HEAVY bleeding after period stopped for 2 days.

Bethany
I had my period and it lasted 5 days as normal. It ended very lightly and with brown discharge. Two days went by and I woke up literally bleeding so heavily. Does anyone have experience with this? This has never happened before. And my periods never go over 5 days. I did have intercourse during Septemeber I don't know if that would mean anything.