Hi sweetie, I'm so sorry to hear you are going through this hard and emotional time.
In May last year I went in for my scan at 12+3 weeks to find that bub had stopped growing around 8.5 weeks and a mm/c. So it had been 4 weeks and still my body did not register that something was wrong.
Luckily it was very early in the morning and they could fit me in that day to have a D&C.

I personally could not have gone through with a natural mc.
We did have genetic testing done and found out the cause.
So it's up to you sweetie to decide what would be better for you.
Xx