Speech delay

My 2 year old has a speech delay and in these past few weeks he’s been saying more words. I got the number for early intervention but haven’t called since he is starting to say more words. My question for anyone Who has dealt with a child with speech delay. Is it normal for them to not pronounce the word right but you know what they’re saying because you’re their parent? Should I call early intervention since he isn’t pronouncing them right? Or do I just give it time? I know a lot of kids don’t say a lot of words right but I’m just curious of what I should do