Side effects of the IUD?

I got the Mirena IUD placed at the beginning of February, and shortly after I started lactating and still am. I used a different OB because my regular one doesn’t use this kind of birth control. I called a few weeks ago to see if that was normal, the nurse was unsure and was going to check with the Doc, I’ve called a few times since and still haven’t heard an answer. has this happened to anyone else??