What are the chances that two babies in a row won’t have a heartbeat?

Li

We went for our third ultrasound in April to find that our baby no longer had a heartbeat. This second pregnancy, we went at six weeks exactly and were told the heartbeat was, again, low. What are the chances that two babies in a row will start with a heartbeat and then have it stop? We’ll be eight weeks when we go again in two days.