Spotting after sex or penetration ?!?

A bit of background I got my iud in June. So I have it in for 3 months now. It the mirena. But lately after sex in the last 2/4 times I have noticed spotting. To be exact pink spotting. Has anyone experienced this???

This did not occur at first it just started to occur, I’m kinda worried and planning to go to the OBG to get check and verify everything is ok. But please advise.