Sex after getting Mirena!!

So I’ve had cramping for the past two weeks since I’ve gotten the iud, but no spotting...or if there is it’s VERY little and VERY light.

My bf and I had sex for the first time, since having the IUD, 2 nights ago and I have been bleeding. Not super heavy, but not light as before.

Could having sex made something go wrong? No pain during or after, and my bf didn’t feel it.