If a person takes P2, it may help prevent pregnancy after unprotected sex. However, it is good to note that P2 is not 100% effective. To reduce the risk of becoming pregnant, a woman is advised to use additional condoms during any other sexual contact after taking P2. In case a woman encounters any unusual signs such as nausea, spotting, or breast tenderness after using P2, it is important to talk to a gynecologist who will give further advice.