How soon can he ejaculate in me after getting mirena (levonorgestrel) iud?

7 days: The IUD, whether it's hormonal or copper, is one of the safest and most effective methods of birth control that you can use. It's long-lasting, reversible, and b/c it's made to work inside the uterus, it doesn't cause systemic side effects. If you don't have it placed during your period, you should wait 7 days before having unprotected intercourse.