Period was being strange?

Katrina
So my period had his at a football game...its all cool like I don't care, but its normally a normal or heavy flow and this time it was extremely light and only lasted 2-4 days instead of my full 5-7 days. Is this because of me being stressed or because of my boyfriend and I being "foolish" in a sense. Like were careful but I don't know..I'm just worried 😟