Most days, I feel small movements a few times a day. Some days it's more, some less. Generally, it's when I first sit down or lie in bed. A few times, I've also felt major pressure outward where she'll push a decent sized portion of my abdomen out a time or two and hold it there for maybe a minute. I don't remember my son ever doing that, but it feels very odd! She stretched her legs straight out in the ultrasound, so I have a feeling that's what she's doing in there.
With my first pregnancy, I don't think I was picking up on any movement until 19-21 weeks.