A new study says usage of one controversial form of birth control is on the rise.
More women are using the morning-after pill, according to a new study by the Centers for Disease Control and Prevention. The CDC survey found one in four women between the ages of 20-24 have used the morning-after pill.
It also says the largest percentage of users are higher educated and feared their other form of birth control failed.
Austin area OB-GYN Dr. Marco Uribe says the pill must be used within the first 72 hours for 90 percent effectiveness because of the way it is intended for it to work.
"It changes the lining of the uterus and also changes the lining of the tube so it affects the migration of the sperm up the uterine wall and affects the migration of the egg up the tube so it actually prevents the sperm and egg from combining," Dr. Uribe said.
Dr. Uribe adds that we do not know the long term consequences of how it impacts women who use the pill repeatedly.
Critics question what the pill actually does and if it should be on the market.