Gestational Sac 6w 4d fetal pole 6w1d

Carla β€’ πŸ‘©β€πŸ‘¦10/2008πŸ‘©β€πŸ‘§9/2010 7weekπŸ˜‡1/2017 Chemical πŸ˜‡5/2017 ChemicalπŸ˜‡9/2017 expecting my πŸŒˆπŸ‘Ά9/2018 praying this one came with super glue😍😍

So my gestational sac measures exact per when I ovulated and baby measures 6w 1d 102bpm. Is it normal to have the baby measure a few days off?