question: Hi doctor,  I was three months pregnant and recently had a medical abortion. I had unprotected intercourse four days before the abortion. I was given 200 mcg of Mifepristone and two days later Misoprostol which expelled the pregnancy. (the intercourse occurred six days before the Misoprostol).  I am worried that this may start a new pregnancy after the abortion was completed as sperm can live up to seven days and if I ovulated immediately after abortion the sperm could be alive to start a new pregnancy.  Please can you help me and give me an explanation of the following:  Can 200 mcg of Mifepristone be effective at preventing pregnancy, if taken four days (96 hours) after unprotected sex? I have found information on the internet which says in some countries that Mifepristone is used as an effective emergency contraceptive. However, they say small doses of up to 50 mcg. Please tell me whether 200 mcg would be most effective?