I told you what you need to do, but sometimes it's more important to know what NOT to do. Obviously some of that varies from person to person and pregnancy to pregnancy, but there are some general rules. Don't sleep on your back. Now that your uterus is bigger and heavier, it can disrupt blood flow when you lie on your back. Don't feel silly calling your doctor with concerns! Being pregnant comes with all kinds of aches and pains and worries. Your doctor would rather tell you that something is no big deal than have you keep a concern to yourself. Don't travel late in the third trimester. Talk to your doctor if you need to travel in the last eight weeks or so of pregnancy. If your pregnancy is high risk, you may be advised to stop traveling even earlier.