IUDs/Liletta Removal

Hello! My fiancé and I just had a baby about five months ago. Eight weeks pp I had the Liletta-an IUD-placed in my uterus as birth control. However, it has been affecting my milk supply so my OB GYN opted to have it removed. I literally just had it removed yesterday. Does anyone know how long it takes for IUDs to wear off? I definitely don't want to get pregnant and my fiancé just informed me that he took off the condom while having sex a few minutes ago. Kinda having a mini freak out.