After pregnancy birth control? Sex concern?

I was thinking of getting an iud post pregnancy, me and my partner have pretty rough sex so it makes me super nervous that something may happen, my second go to has been pills but my mother has been nudging me to consider things that are more long term as I don't want to get pregnant again ANY time soon. One is definitely enough for me! Just worried about how my kind of sex life (very rough) may affect an iud. Quite a few times my boyfriend has a hard time holding back and starting off slow as we get into things veryyyy quickly, and I end up getting hurt. Bleh! I just don't want to get a 5 year iud and end up with something terrible happening! I'm also 37 weeks pregnant so maybe hormones are making me so iffy about everything.