Early detection ultrasound

Steffani

Went in for a private scan tonight. According to my app im 6 weeks and 2 days. They measured me at 5 weeks and 4 days. Said they saw a gestational sac and a yolk sac but no heartbeat detected just yet. Was told everything looks great.

Still a little nervous due to previous miscarriages but feel so much better this time around.

Is it common to measure 5 days behind?