A "slipped" or herniated disc can be possible, but often sharp, disabling back pain during pregnancy is due to joint laxity or "looseness" of the sacroiliac joints. Pregnancy hormones can cause softening and stretching of the ligaments long before there is substantial weight gain or fetal growth. Sacroiliac joint pain is indeed the result of traction, or pulling, on a nerve or nerves.

Based on the information you provided, I recommend you consult your physician and a physical therapist specializing in the treatment of pregnancy-related back pain. Further testing may be indicated to rule out a herniated disc. Applying a cold pack to the painful are for 20 minutes may be helpful, as well as maintaining symmetrical sitting and standing posture. Avoid standing with your weight shifted onto one leg, or sitting on one side of your buttocks. Placing two pillows width-wise between the legs may also be helpful.

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