Ladies with the Mirena IUD,

The first real period you had after getting your IUD placed how long was your period? I got mine placed March 8. And I started my period March 27. It's now day 7 of my period and it went from being super light to heavy. And I feel like it keeps getting heavier and heavier. I have no cramping. Just bleeding. I'm sick of buying tampons. Is this normal? I'm thinking about calling my Gyno on Monday, but I wanted to know if this is normal. I've always done birth control pills.. So I'm feeling like I'm walking down a dark tunnel with this IUD thing.