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The ligaments that support the uterus will stretch and with this stretching may cause mild cramps. 3. Miscarriage-Cramping during early pregnancy, especially accompanied by spotting or bleeding, is a warning sign of a possible miscarriage.
Causes of Pregnancy Cramping During Trimester Two and Three. 1  Labor - During early labor cramping and back pain are common symptoms.  Round ligament pain - The infamous round ligament pain strikes pregnant women often in their second and third trimester. As in early pregnancy the uterus continues to stretch and grow.