Period with Mirena IUD

Patient: I got my mirena IUD in august of this year and it’s now September. I started bleeding yesterday. But the doctor that put my IUD in told my i wouldn’t get my period anymore because of the birth control i was taking on top of the mirena to help with cramping and any bleeding in case there was some. because in the first three months you and have bleeding all the time. SO, what I’m wondering is if this is a normal period because it is a month after when i got the IUD or should i be worried about the IUD have moved and call the doctor back?