I actually just so happen to have a ob appointment today so i told her she checked on the sono, but couldnt see anything but she suggested i go see a sono specialist just to check cause i shouldnt feel that, so im still concerned. But on the good side she said heart rate sounds fine and i have still been feeling movements, but only on the opposite side of where i felt the pop. I felt the pop where the legs were, and the arms and head is where i feel movements.
Just go to the er. They will do a scan to make sure it's all ok. Best luck