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Your Changing Body Week-by-Week

From the time of conception until the time you give birth, your body is going to go through some major changes. Find out what to expect with our week-by-week look at your changing body.
pregnant woman holding back Week 31

You may be noticing more hip and lower-back pain. What gives? Pregnancy hormones are relaxing the ligaments and tendons throughout your pelvic area so that the bones can spread to make room for delivery. Your expanding uterus may also be putting some pressure on the sciatic nerve, which runs from your lower back to your buttock and hip area and down the back of each leg, triggering chronic tingling or numbness along its path -- a condition called sciatica. But it's usually not serious, it won't affect the baby and it will likely become less intense as he shifts around in there.