This method also may block ovulation so that the ovary does not release an egg at all. Therefore, although the Yuzpe method may prevent an egg from being released, there are some cases where an egg is already fertilized and is prevented from implanting in the uterus. This may have personal or religious implications for the patient considering this method. As this method is quite safe, any woman who is not already pregnant can use this method within 72 hours of unprotected intercourse. Women taking other medications or being treated for medical problems should always discuss new medications with their doctor.
All medications have potential side effects.
The Yuzpe method can cause nausea in some women, so you may wish to ask your physician or health care provider for an anti nausea medication just in case. You should expect a menstrual period within 21 days of taking the pills, and if one does not occur then there is a chance the medication did not work and you are pregnant. In this case a thorough evaluation is in order to rule out pregnancy. An important point is that even after taking emergency contraception you should strongly consider resuming, or starting, regular contraception, as emergency contraception is not nearly as effective as the regular use of birth control. Regular use of contraception is the best form of birth control other than sexual abstinence.