Iud causing partner pain

I just got and iud this week, and had sex for the first time with it in and it hurt my partner. He said it was poking this head of his penis, and hurt enough that we had to stop pretty much right away.
I have heard its normal for them to feel it, but has anyone had any experience with it poking them and causing pain? Is there any way to fix this?
I could feel it kind moving a little in me as well which didn't hurt but was a little annoying.