Mine isn't until the 21st and I'll be 12 +3 but only just on 12 based on ovulation dates. So it might not be clear either way. In order of "degree of worry" I'm most concerned about :
1) the baby being healthy without any suggestion of chromosomal abnormalities (I'm 39).
2) having twins
3) the gender.
So if I'm only focused on obsessing about the nub in three weeks then things are going well.
Will you have a gender scan? I won't but my ob will likely see me between 12 and 20 weeks and her guesses are pretty good.