Plz help. Pregnancy chart

I am what I believe to be 6 weeks 3 days pregnant. But had a scan today and only seen a sack nothing else, they did see blood clot which I’m assuming isn’t a good thing and they said I could be earlier or possible miscarriage will occur soon. My bloods today were 1632, they will be checked on Sunday to see if they double and another scan is booked for next Friday if I don’t miscarry before then. Does anyone looking at my chart believe I could be earlier than 6 weeks 3 days? I’m so confused and just thinking the worst now. Thanks.

My scan from today. They said measuring under 6 weeks.