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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.
While cramping can be common, there are some serious causes of abdominal pain during pregnancy: 1  Ectopic pregnancy â This type of pregnancy happens when the fertilized egg implants outside of the uterus. Ectopic pregnancies can cause painful cramping and is a serious medical condition that must be treated by your doctor.