How heavy is too heavy?


I’ve recently gotten an Copper IUD and this will have been my second period since I’ve gotten this and the first period was early and light and barely any cramping -I’m pretty sure it was early because of Plan B taken previously. Anyway like I said this is my second period since I’ve gotten it and my flow is sooooo heavy compared to what it used to be. I don’t even understand how to tell if I’m bleeding too much or not! I don’t think I’m bleeding through my super tampons in two hours. I think it’s more like 4-5 ish. Is that normal? Am I being paranoid? Help!