Can somebody help

[Hannah4993]

I believe I am 6w5d pregnant based on my lmp.
However, an early scan today shows I’m only about 4 and a half weeks. I got a positive test almost 3 weeks ago and I know the date of conception was the 1st February as that is the only day I saw my partner this cycle due to working away.

How can I only be 4 and a half weeks if I know when I dtd and I got my first positive test so long ago. Thanks in advance

Early scans are very inaccurate due to size of baby.
That's why nhs provide first scan at 12 weeks as this is the most accurate time for measurements.
Stick to the dates you know to be correct because it's likely your 12 week scan will be closer to that

There can be big discrepancies in the early stages with measurements. Also, even though you know the date of conception, you don’t know how long implantation took.

Are you being scanned again in a couple of weeks?

Yes I am being scanned again in 10 days. They told me that if my dates are correct, they would be able to see something by now but they could only see the gestational sac with nothing in it