When you get an IUD placed soon after giving birth, there is an increased risk of it falling out (what doctors call expulsion). The chance of this happening decreases after six weeks postpartum. Other than that, there are no particular side effects from getting an IUD immediately after birth.The general side effects of the copper IUD are bleeding between periods, cramps, and severe menstrual pain with heavy bleeding. Meanwhile, the side effects of hormonal IUDs include headaches, acne, breast tenderness, irregular bleeding, mood changes, and cramping.