Reuters -- Women seeking medical abortion, sometimes called the “abortion pill,” often first undergo an ultrasound test, but a new study suggests that may be an unnecessary step. In the U.S., medical abortions can be performed within nine weeks of the first day of a woman’s last menstrual period. Most medical abortions involve taking the drug mifepristone (Mifeprex) followed by misoprostol, which causes the womb to contract.