Caththerese, thanks for your reply. I really hope my ds will go the same way as your dd! A friend of mine said that all we needed to get ds talking was an appointment for the assessment, and he'd start speaking in sentences a couple of days before... just to show us up as neurotic parents. Seems to have worked for your family!
Yes, we used to be bilingual - one parent, one language, with me speaking German, dh speaking English. However, when ds was still not saying any words at 2yo, we had endless rows about it - dh wanted me to stop speaking German as he thought that if there was some kind of language disorder, the bilingualism would throw ds back even further. Eventually I gave in, but still feel really bad about it. I'm hoping that they will tell us at the assessment that it won't make any difference whether we use 2 languages or just 1.
Re the pointing - well, he waves his hand in the general directing of the things he wants, but he doesn't point out things of interest, and he doesn't point with the index finger. For a while, this drove me mad with worry, especially after reading so many posts here that link non-pointing with autism. BUT I then realised that ds has other ways of sharing attention - eg the other day we were having dinner with friends, there was music on in the background, but so low you couldn't really hear it. Then there was a lull in the conversation, and ds noticed the music, turned to me with a big smile on his face and signed "music" ! If that's not shared attention, then I don't know what is! (BTW, he only has 3 signs and refuses to learn any more)