If they say they can, they most certainly know what to look for. My OB doesnt, but I do (have studied so many pics and videos on here since I was expecting my dd ;) and she said to me we could look if I wanted to....
My kids were clear as a day. In fact, my ds2 was clear as a day at 11+3 (as some boys tend to be), I didnt even know anything about nubs back then, it was just soooo obvious that there was a little penis sticking up..... My dd showed a clear labia at 13 weeks in a potty shot view and a flat nub in profile. People here guessed 95% girl based on my nub shot (the potty shot was sadly not printed off :( )
Fingers crossed for both of us, I am not majorly bothered right now, just hoping to see a heartbeat as I havent had a scan since week 8....what time zone you in? I am in central European and will probably be back early afternoon x