Had a dating scan and they put me back 9 days!

I had my dating scan done today and they set my back 9 days :(. I am now 6w2d. I had an irregular period so I was never sure of when I was ovulating. So now I have to go through the last 9 days again haha. But I got to see the babies heartbeat and it was already 140 so my doctor was very happy which makes me feel better. Although I have been extremely sick the last 5 days so I'm not looking forward to hitting week 7 again haha. My new due date is December 22. My birthday is on the 25th so I could potentially be sharing my birthday and Christmas 😂.