16 weeks 5 days can't feel baby yet...

Terra • Married to my Mr. Right. Mom to my IVF heart warrior daughter born November 16, 2017.
First time mom to be. Is it normal to not be able to feel my baby yet? I keep reading about how all these ladies can feel theirs move and I can't. I had a couple "flutter" feelings a week ago and haven't felt anything since then. I'm starting to get nervous for my 18 week ultrasound.... hope it's all ok.