Pain in the lower abdomen may occur as a result of stretch on the ligaments as the uterus
expands; it may also occur in uterine irritability, apart from non-reproductive causes related to the urinary system
and the intestines. The status of your pregnancy
should be evaluated with regular monitoring and sonograms. The pain due to stretch usually stabilizes as the uterus grows out of the pelvis. If the pain is severe, it is definitely not normal and needs to be assessed by your doctor. Take care.