Gestational Sac 6w 4d fetal pole 6w1d

Carla • 👩‍👦10/2008👩‍👧9/2010 7week😇1/2017 Chemical 😇5/2017 Chemical😇9/2017 expecting my 🌈👶9/2018 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?