If heartburn has become a problem for you, pay attention to body positioning after meals. Stay in an upright, seated position until your meal has had time to digest. This position will help keep stomach acids from migrating into your lower esophagus and causing heartburn. Even if heartburn's never been a problem before, it may bug you during this baby-growing phase because pregnancy hormones relax the stomach walls.
Don't forget to consider how you're positioned when you're lying down, too. Rather than just flopping onto the couch (who could blame you?), lie slightly elevated on your left side. By lying on your left side, you'll keep your uterus from squishing your liver (which is on the right), thus improving circulation to your heart and allowing better blood flow to your baby, uterus and kidneys. Talk about a win/win situation.