Has anyone been concerned about their LO having autism?

may

My son has a speech delay and has been in therapy for about 6 months. He has been improving but he still doesn’t form 2 word sentences. He only says “scripted things” he will sing a song word of word but won’t ask for water or to eat. There are others signs we have been seeing in him. We’re waiting to have him evaluated for at least another 6 months to see how his therapy goes. Is anyone else going through anything similar?