What was your experience with ECI speech therapy

At my sons 18month check up they suggested speech therapy. He’s now 20 months and still only says mama. I’ve been hesitant to start speech therapy because I don’t know what to expect and fear the worst. I think their going to show up with cps people and check my parenting skills and blame me for his lack of language skills or find something else wrong like tell me he has a learning disability or that, I will be judged at how I parent like it’s some sort of grade or something. I also have a 6month baby so I’m worried that they’ll both cry when they come to do the evaluation. If anybody can please tell me there experiences and I also want to know if you didn’t have speech therapy how long did it take you’re kid to talk?