I have a son with a speech delay. I know how hard, very hard it is to pick up that phone and call early intervention. It was one of the hardest things I have ever done. None of my friends supported me. They all told me about kids who didn't talk and told me to read "The Einstein Syndrome". I felt like I was somehow betraying my son when I called.
Looking back, it was one of the best things I ever did. And I say that as a mom whose kid got a lousy initial eval. They told me he was prob. autistic. I knew they were wrong but got the therapy anyway. It turns out he has a motor problem. He is almost 6 and gets speech, OT and PT. He is a happy, sweet little boy. He just needed the speech therapy to help him tell us what he wanted to say.
You are doing the right thing. Speech therapy is pretty fun for kids. We had only great therapists from Early Intervention. The therapy continued through the school system when he turned four but it was still home based. Now that he is old enough for kindergarten in my state (NY) I have to take him to the school for his therapy. So far, it has been easy and everyone has been great.