I’d say 7-8. Too big for less.
Since the yolk sac is still intact less than 10 weeks but like others said probably around the 7-8 week mark.
I think about 7, mine looked bigger at 8, more defined but hard to tell from just a photo. Hope you get the answer you are looking for x
They first tell you due date based on the first day of your last period, later they check the size of the fetus and based on the size they give you the final due date. Also it depends how long is your cycle. At lease this is what I was explained because I went to scan when I was 6 weeks and this told me that I’m 7 based on the size of the fetus
I’d say 7 x
7 weeks