My lower back cracked really loud it didn't hurt but it sounded like it popped. Like have you ever heard someone pop there shoulder and it makes a loud crack noise like it popped outa place ... Well my lower back did that while I was driving I just moved around to get comfortable in the seat and it cracked I'm scared it was the baby's arm or leg or back ??? Baby is moving normal and no bleeding etc everything is good , that noise just has me thinking 😑