Measuring small on scan?

Hannah
Has anyone been for an early scan,measured small but then everything has been ok? 
I went for a scan yesterday measuring 3mm which they said they think I'm only 6 instead of 7 weeks.we saw a heartbeat but I can't help but worry? 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors