Hi, my son is 3.5 years and is not speaking yet. He has understanding but it's limited to what is happening now and cannot foresee or think outwith the present time (so, for example, if I were to say we were going to the park he wouldn't get it until we were physically there).
He answers to his name, is fun, loves a carry on and plays with his peers. However, he has a couple of quirky traits.
He has been assessed for autism but the Dr's are on the fence so he'll be reviewed later. They are keen to ensure he is not misdiagnosed and are confused because he has many traits not typically associated with autism. The traits he does have can also just be typical age appropriate behaviours.
It was established that he has glue ear and recently had grommets put in which have helped with his attention span etc...
He's seen SALT and it's been suggested he may have a communication disorder. So we're looking in to that just now.
All of this is to say: if the nursery have told you there's maybe an issue, I'd listen. They are experienced professionals who would not raise concerns if they didn't have any. It may turn out to be nothing but (in my experience) it has been beneficial to explore all the options.
I understand it may be a bolt out the blue for you. In my situation I was aware something didn't seem right. My son is an only child and I often forget he's not where he should be until I see him with other kids his age. So, at soft-play or with friends kids. It's almost like I'm in a bubble that pops occasionally!
I wouldn't worry about it OP, things will become clearer in time.