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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.
Leg Cramps During Pregnancy: Causes and Treatment. It is not uncommon to experience leg cramps during pregnancy, particularly in the third trimester. Nearly half of all pregnant women suffer from muscle spasms in their legs, with cramping more frequent during the evening.