After medication abortion, women may quickly become pregnant again and therefore need an effective birth control method right away. Intrauterine devices (IUDs) are very effective for preventing pregnancy. IUDs are usually placed more than a month after abortion. This study will randomly assign women having a medication abortion to two groups, either having the IUD inserted one week after medication abortion or having the IUD inserted more than four weeks later. Women will be followed for six months to compare how many return for IUD placement in the two groups, how many are using the IUD after six months, experience with pain, bleeding, and cramping, how easy or difficult it is to insert the IUD, how many IUDs are expelled or removed, and how many women are using any birth control six months after the abortion.