What happens during a medical abortion

Hiya, I'm 15 and going to get an abortion tomorrow I'm only 6 weeks. I have properly thought out about what I would like to do and I am very definite. Can anybody explain what happens during the medical abortion process?
-how many appointments do I have?
- how many pills do I need to take?
- is an abdominal or internal ultrasound involved for beingn 6 weeks?