Month 5 ????

This is my 5th month having my IUD. I started my period yesterday and was expecting a heavy waterfall this morning when I woke up. But, it's like brown?? Is this normal? I've heard by the 6th month your period is supposed to stop. Nothing is red. I've called my nurse so many times about my IUD I feel like I'm being obnoxious and they're getting tired of me. can anyone help? Thank you.