I had a sonogram last week and the baby had a heartbeat of 141 and measured 13 weeks and 3 days. Then I had another one on Friday at the ER because of a fall and they wanted to check my baby but on the paperwork they measured the baby at 13week2 days and a heartbeat 148. Should I be worried? My friend said it depends on the radiologist and technician doing the sonogram and dates can be off by a week and be okay.