As soon as you find out that you are pregnant - which often happens during week 4 - you should schedule your first prenatal appointment with your doctor. Your doctor may perform a physical exam that includes lab tests and a review of your medical history. Make sure you tell your doctor about personal and family history of any medical conditions, and give your doctor a list of medications you are currently taking. That way, your doctor can use that information to help you throughout your pregnancy. Then you can work with your doctor to figure out your due date. Since week 4 may be the earliest that you know you are pregnant, you will probably have a lot of questions for your doctor, and that's okay. Don't be afraid to ask about anything you are wondering about.