Early scan shows way earlier than first day of last period??

in Pregnancy
Hi girls.
I went for an early scan today as I thought I was 9 weeks Going off the first day of my last period. I went and there was just a yolk sack and no baby. Measuring at 6 weeks? Has this happened to anyone else before and all been okay? She said it was a healthy yolk but I’m confused by the 3 weeks difference?
had a missed mc in July at 12 weeks so I’m so upset! Xxx
had a missed mc in July at 12 weeks so I’m so upset! Xxx
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On a brighter note, they did say it was a healthy yolk, so that's very reassuring.
I hope all is okay. I can’t go through it all again xxx