What Factors Determine A Successful Abortion?

after taking misoprostal 200mcg x 2 tablets heavy bleeding started in about 30 minutes which last for around 30-45mins approx. after that nothing happened no bleeding no cramping nothing. took another dose of same amount after 3-4 hours but nothing happened just a blood drop. pregnancy is Cou3-4 weeks. what to expect? pregnancy terminated or continued? going to have ultra sound today lets see what happens.