Measuring 6wk1d instead of 7wk1d

Deedles • 🇦🇺 Finally got my BFP!!! 🤞🏼 due December 2019 💕🤰🏼

Hi ladies!

I went in for my 7wk ultrasound today and I was measuring 6wks 1d. The dates don’t add up if I’m 6wks 1d so I’m a little confused. Saw the heartbeat 125bpm... has this happened to anyone else?

Thanks!