Confused 😐

So I had my dating scan today and all is well I thought I was 9 weeks 5 days but the scan showed 7 weeks 2 days my doctor said to come back in 3 weeks because it was a bit early but that I could actually be about 9 weeks now! 🤔 has this happens to anyone? I'm showing I know it could be bloating but I don't feel bloated