Echo too early?

Good afternoon,

I had such a rotten day yesterday and I’d really like to know if there are other women who have gone through this.

My husband and I have been trying to get pregnant for a few months now.
Since my cycle isn’t really regular, it’s hard to estimate how things are going.
So I stick to an average.
Tested on Jan 3rd: Negative. But 5 days later the test was positive.
Because I have experience with miscarriages, I could see the midwife pretty quickly.
They estimated I’d be around 6 weeks based on my last period (Dec 7th).
That appointment was last week. On the external scan, there wasn’t much to see, and on the internal scan, just a tiny dot. She estimated me at around 3, max 4 weeks, and I had to be prepared for it to go either way: either it was something or nothing.
I got a test to take home and an appointment with the sonographer was made for the following week.
The test was incredibly positive, so I was happy again.
The appointment with the sonographer was yesterday.
I had an external scan, and there was immediately ‘something’ visible. It wasn’t big: according to her measurements, 1.5 by 1 cm. But I was already happy because in my eyes it had grown!
An internal scan wasn’t done.
Still, she told me she had bad news and that it hadn’t grown; it had stopped at 4/4.5 weeks. She wanted to refer me immediately to a gynecologist for a D&C...
No matter what I said, she stuck to her point that it was wrong, and I got information to take to the gyno.
My other option was to wait until my body expelled it naturally.
I really don’t know what to do right now. I feel very pregnant, haven’t had any bleeding or anything... In my opinion, I’m less pregnant than they assumed...
Any other women with this kind of experience?
I’m quite shaken up and it makes me very insecure.
Greetings,
L