Hi L.,
I am also pregnant right now, due at the end of Sept, with my second daughter. It sounds like your baby is moving plenty! I have done a fair amount of research on this, especially in my first pregnancy. One of the reasons babies move in utero is that they enjoy the stimulation of rubbing against the inside of your uterus--it feels good to them and helps them develop their sense of proprioception, which is everyone's ability to know where our bodies are in space (i.e., you know where your foot is right now in relation to your head without looking for it). When you are active and moving around, or rubbing your belly, you are giving your baby the massage or stimulation he/she needs, and the baby doesn't need to move. You will notice that after you eat, when the baby starts getting that shot of nutrients, it will move in a pronounced way--that's the sugar from your food. Also, when you are very still, perhaps meditating or about to go to sleep, the baby will sometimes move to self-stimulate as described above. Of course, you have to also remember that your little baby is sleeping inside you whenever it's heart desires, and then you won't feel movement. It sounds like you may be already be noticing a playtime and nap routine throughout the day for your baby!
A wonderful book on caring for babies that discusses this is called Vital Touch by Sharon Heller. It's an older book, so you usually have to order it. The main thing L., is that you trust yourself and your baby to do what comes naturally, and that will be the best for both of you!
Congratulations in advance!
P.