Have you felt movement yet?

I'm 16 weeks, third pregnancy, but last pregnancy I miscarried.

With my first, I felt movement at 4 months.

I thought I've been feeling movement these past few weeks, but I'm starting to think it was gas, mainly because when I was having a sonogram last week, I thought I felt baby move, but baby didn't move on the monitor.

Have any of you felt movement yet? When did you start feeling movement in all of your pregnancies?

I can't wait to feel the kicks, but I'm getting worried I still haven't felt anything consistent.