The enlarging uterus
puts a stretching on the supporting ligaments and this may lead to pain especially during the first pregnancy
. Otherwise, any pain which you think is related to your pregnancy should be viewed with caution. Since ectopic gestation has been ruled out, you should also exclude infections of the bowel and bladder. Contact your obstetrician for advice. Meanwhile, take absolute bed rest
, avoid intercourse and stress
. Good luck.