Period, too much blood??!

So. My bf and I were having sex and I started my period, I havent had one in a couple months since I got the nexplonon put in. (I also had a baby 6 months ago) I have a normal period since the baby tho.

Anyway, it was a LOT of blood. I put a tampon in and maybe 5 minutes later I had to change it, then another 5 minutes and had to change it again, it's been maybe 5 minutes and I'm on my 3rd one....

Is this normal???