developmental clinic

I'm kind of scared to go to our appt. At the developmental clinic. I'm scared of what they are going to say. My baby was born at 26 weeks, she is now 9 months, 6 corrected. She doesn't roll over, or get into a crawling position yet, but it seems like she's trying to skip steps. (If that makes sense.) She tries to sit up on her own while laying on her back, she can sit assisted, she jumps like crazy in her bouncer and her exersaucer. She reaches for her toys and plays with them, but she just won't roll. During tummy time, she rolls sometimes, but she always keeps her feet off the ground. Did any of you preemie mommies experience anything like this? How old was your baby when they started to roll, crawl, sit, walk, ect?