Need some advice on BC please!

My husband and I have been using condoms since after our baby was born a few months ago but it has reduced his sensitivity to the point where he can't orgasm.

I'm thinking of trying a different type of contraception (though a bit scared, don't like the thought of how it's going to 'alter' my body).

I've tried the pill before but wasn't a fan since I had too many side effects and I don't like that.

I'm thinking of maybe trying and IUD/IUS? I'm a bit uneducated about them though. Stupid question but will having rough sex cause the IUD to move?

What side effects can you get with an IUD/IUS?