Also, i found if i was busy, or pre occupied, that i would be focusing more on what i was doing, and not what bubs was doing, so i possibly missed some things as well. And also, keep in mind that when you are active, tends to put bubs to sleep.
EG - yesterday, i was out and about from about 8am till 3, and i hardly felt bubs move at all. This morning, i am just at home, on the net and doing abit of washing etc, and it is kicking like there is no tomorrow!.