Ovulate with IUD?

Anna
I have the Mirena IUD and I've onky had it since end of may. I've had one period with it but I'm currently having what feels like ovulation pain. So I have some left over clear blue digital (the one with the smiley face) sticks so I just took one and it shows peak surge with the smiley face. If you ovulate with the iud does that mean there's a chance I could get pregnant right now? Me and dh had sex last night and I never worried about it with the pill cuz I know I've taken it but the iud is just placed there right. I know how it works and how well it works but still. Is it normal to ovulate while having an iud? I know for some women it stops ovulation altogether...