As far as symptoms of pregnancy are concerned, lower back pain is a pregnancy symptom that almost half of all pregnant women experience. Many women feel it early on, and quite a few will experience lower back pain all through their whole pregnancy.
Lower back pain in pregnancy occurs for several reasons. Your weight changes, with your center of gravity shifting towards the front of your body. Most of extra pregnancy weight is in the front, which creates a strain on your back as it tries to adjust your balance.
The way you sit as your body changes, along with the way you sleep at night will also have a pronounced effect on how much lower back pain you have to deal with. If you are a side sleeper and your body is out of line from all the physical changes, your lower back will feel the difference. A pillow positioned between your knees can alleviate much of the pressure on your lower back.
Additionally, your body is changing in preparation for delivering a baby. Your muscles, joints and ligaments are getting looser to get ready for labor. Many women say their lower back pain disappears immediately after birth, and while symptoms of pregnancy do disappear after birth make sure you care for your back during your pregnancy to avoid future problems.