The not knowing is so hard.
My story is a positive one. DS had no words at all at that age and would hand lead a lot. He ignored us and didn’t respond to his name, but would come and get us if he wanted something. He could also point from 18 months (though would not look at us when he did so or do the joint attention thing).
He could copy us doing “things” (eg he’d watch us using a toy and do the same). But he wouldn’t imitate “us” at all (no copying funny faces or sounds or actions). I spent an entire year trying to teach him the makaton for “more” with no success whatsoever. I did feel he understood some language, albeit delayed and only concrete stuff (eg at age 3.5 he had no conception of Christmas or presents).
Anyway, fast forward, at age 4 he underwent a development spurt and started to be interested in engaging with people for the first time. He imitated a sound for the very first time aged 4. He didn’t say his first word till age 5 and only after a year of intensive speech therapy (this only started properly after he went to school, the pre school service was awful). In addition to (or perhaps because of) the early lack of interest in social engagement it emerged he has severe verbal dyspraxia (problems forming the motor movements needed for speech) and has had to consciously learn how to make the movements.
He’s now nearly 7 and extremely chatty and way more sociable than his non-speech delayed older sibling. He’s doing well in school and thriving in mainstream classes for several subjects. His speech still is unclear, he can’t say certain sounds and finds speech very hard but we have intricate chats. And even before he could talk, once he started to engage it was amazing how much one could communicate with alternative communication (sign, mime, drawing).
One thing I found helpful in dark moments was to read some of the blogs written by non verbal teenagers and adults. Many of these are deeply moving and demonstrate that a person’s ability should not be judged by lack of speech.
Best wishes to you.