Ideally, you should see your doctor

Ideally, you should see your doctor once each month for the first 28 to 30 weeks of your pregnancy, then every 2 to 3 weeks until 36 weeks, then once a week until you deliver the baby. If you have a medical condition such as diabetes that needs careful monitoring during your pregnancy, your doctor will probably want to see you more often.
During visits, your doctor will check your weight, blood pressure, and urine, and will measure your abdomen to keep track of the baby's growth. Once the baby's heartbeat can be heard with a special device, the doctor will listen for it at each visit. Your doctor will probably also send you for some other tests during the pregnancy, such as an ultrasound, to make sure that everything is OK with your baby.
One part of prenatal care is attending classes where expectant mothers can learn about having a healthy pregnancy and delivery and the basics of caring for a new baby. These classes may be offered at hospitals, medical centers, schools, and colleges in your area. It can be difficult for adults to talk to their doctors about their bodies and even more difficult for teens to do so. Your doctor is there to help you stay healthy during pregnancy and have a healthy baby - and there's probably not much he or she hasn't heard from expectant mothers! So don't be afraid to ask questions. Think of your doctor both as a resource and a friend who you can confide in about what's happening to you. And always be honest when your doctor asks questions about issues that could affect your baby's health.