He caused me to get my period 2 weeks early

So me an boyfriend are having a great night. Its him an myself the kids are gone for the night. So we start off slow an loving . Then things evolved into hardcore wrestling match ( wink wink.) Fast forward next morning the bloody red sea. Yes the Red Demon arrived 2 weeks early. Has anyone else have amazing sex then boom have the Red Demon just kick down your door unannounced? This is the second time its happened. What changed?