DD1 didn't speak any words at all until she was about 2yrs+3 months. Not a word. She wasn't even particularly verbal - little noises but it wasn't as if there was lots of babble that didn't make sense. She was well ahead of developmental milestones for just about everything else but speaking way behind.

FWIW, she is now the biggest chatterbox with an enormous vocabulary. She speaks very clearly with no issues whatsoever.

I think being proactive is great - if there is a problem the quicker you get on it the better - but some kids just do things later than others. They all seem to catch up in the end.