second ultrasound results!

Sarah
Went in for my second ultrasound! It was so nice to see my little one's heart flickering away! Had originally thought that I was 7 weeks but after seeing measurements and heart rate they bumped me back to 6 wks 4 days. Is this something normal that happens?? Heart rate was 126...I'm thinking this is good for 6+4. Any thoughts and opinions would be appreciated!