Nub guessing - when is best ?

I would move it. My scan was at 12 weeks even. And my main obsessions came from the fact that the baby was measuring at the low percentiles of 12 weeks (still at 12, but right on that line) and its nub looked girly. I could only think that my kid would be in that 20-25% at that age that would go on to rise up. I would have felt more "secure" in the guess if it had been a later nub shot, even just 12+4 would have made me less "nuts" over it. It didn't end up rising and she is all girl. But I feel I could have avoided some of the "questions" about age and rising nubs if I had gotten a slightly later scan. Waiting would have been worth it to me, personally.