*SLIGHTLY URGENT*Problems with Mirena?

Corrinne
I just got my mirena iud last Thursday and I was hoping it would be a solution to my heavy periods I was having...I am on Xarelto for a pulmonary embolism so I expected the bleeding to be heavy but I have been going through a extra strength overnight pad every two hours...Is this a common issue with the IUD? Is there anything I can do? I have been trying to contact my doctor's office for a few hours now. 
Update: my doctor's office said its only really a problem if I'm changing every hour...but to me it just doesn't seem normal that I would bleed so much.