Small sac

Hi I’m Rebecca I’m new to this page😊 has anyone ever been told they’ve got a small sac? My baby’s measurements are 16.5mm and my sac is measuring at 17mm so I’m currently 8 weeks and 2 days pregnant but my sac is measuring 2 weeks behind 😔 when I’ve googled this it’s saying most people go on to have a miscarriage which is freaking me out!! Has anyone had anything similar stories and has it been successful for them

This is a picture of my baby at the scan which to me looks like it’s got room