Gushing on period?

Ok so I woke up this morning and it was the second day of my period which is usually the heaviest. I was laying on my side and all of the sudden it felt like I was peeing but it was my period. It was a really fast gush of blood and I don’t really know what happened? I’m kind of worried something is wrong because that has never happened to me before and it was a lot of blood. Thanks.