If they suspected anything then they would have mentioned it at your earlier scan. My one was booked at the ultrasound clinic after I finished my 12wk scan. She booked the day herself and gave me an appointment card which stated it was 20 wk scan. So I'm guessing my local hospital arrange it at 20 wks.
I got a scan at 17+4 and the doctor could already look for almost everything there. The only thing he said is that the heart isn't completely formed at this point yet, but I'll have my next scan at 23 wks, and they should be able to look at it then.
Normally, they can already tell the sex at this point. My LO kept her legs closed all the way through, but the doctor managed to poke long enough to say that it's 90% girl. It has been confirmed last week.
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