Iud & big man part

Hey ladies, a bit tmi but my bf has a big dick. We’ve been having a lot of unprotected sex lately. I want to get the copper iud, but sometimes he hits my cervix when we’re doing rough or when he’s speeding up. I’m afraid if I get the iud, it’s going to hurt/stab me. Anyone have any experience in this? Lol comment below please! & thank you 😊 ❤️