Can I expect to have pain in my spine while pregnant?

Yes. It is very common for women to develop lower back pain during the pregnancy. The added stress of the pregnancy and weight of the fetus can add to this. This can cause pain in the lower part of your spine. This should resolve after the pregnancy is over.
Yes. The spine moves during pregnancy to adjust for the shift in center of gravity. Pregnant women need to lean back to keep from falling forward resulting in pressure and movement in the lower lumbar spine. Excercise, yoga, heat (not on the uterus/abdomen) and a good chiropractor should help most women relieve this spinal pain.