Cramping/bleeding after sex with mirena iud

So I have the mirena IUD. I will have had it for a year this coming September. I still cramp and bleed after having sex with my boyfriend. TMI, but I’d say he’s only slightly above average in size, and I even cramp afterwards if the sex is extremely gentle. This didn’t happen before the iud and I was expecting this symptom to go away as my body got use to the iud. I’ve had it checked over 5 times to make sure it’s in place and nothing is wrong. Does anyone else get this?