Biggest fear

... Is going back and the baby stopped growing ... Had an U/s at 5w6d and measured 2 days behind and was just sack n yolk ... Had another u/s at 7w and was measuring 6w4d and HB of 115 -- all looked ok ... I have MAJOR pregnancy symptoms and no reason to have problems.. I had a miscarriage 2x years ago and then have a 6.5 yr old daughter with no complications.. I keep seeing all these posts of miscarrying and often wonder how many were after the heartbeat was found ?! Ohhh the woes of motherhood !