Didnt want to r&r, but i dont know. I would think they'll be able to tell though, at the private scans very often they give a pretty definite gender guess at the 12 wk scan,so id think by 15 weeks that should be even more so the case.
Saying that though,iv seen tickers that at 16 weeks say something like"my gender can now bedetermined by an u/s".
Il be interested to know though, as i really want to get one done. By the way, i thought they didnt do 4d ones til about 22 weeks or something, only ask as id like ton get one asap, but most websites dont let u book til further along, i guess so u see more??
GL!! I bet u cant wait!! xx