Reassuring to hear real life "movement" experiences. I can't remember how often I'd feel movement with DC1 as I wasn't anxious during that pregnancy.
However, I've had a miscarriage since so am far more cautious this time round.
I'm 25 weeks and some days feel hardly anything. I do have a posterior placenta. As PP says, I generally feel happy if I feel some nice movement at least a couple of times a day.
I find she moves most after I eat a huge meal (last nights loaded nachos and chocolate pretzels worked a treat!!)