It will depend on how many weeks pregnant you are. You may have a choice between a medical abortion (which means taking medicine to end the pregnancy) and a surgical abortion such as vacuum aspiration or dilation and evacuation (D&E).
After 9 weeks, surgical abortion is usually the only option. The risks from having an abortion in the second trimester are higher than in the first trimester.
If you think you might be pregnant, see a doctor as soon as possible. If you are pregnant, this is an important time to learn as much as you can about your options. If you are thinking about having an abortion, it's best not to wait. The earlier you are in your pregnancy, the more options you are likely to have. Also, the risk of problems will be lower.
Your doctor will ask about your medical history and will do a physical exam. You will have lab tests to make sure that you are pregnant. You may also have an ultrasound.