IUD Cramps

Hello, I’ve been having pretty sharp cramps ever since I got my IUD in back in February. I’ve started noticing that after I have sex, for about 5 to 7 days after I will spot and have sharp cramps almost constantly. I’ve went to the doctor and they’ve checked and said that it’s in the right place but I can’t help but think that there’s something else going on. Does anyone else have this happen to them? I have the Mirena IUD.