Ducktales, my midwife just says 10 kicks per day, whenever they occur is fine. My girl is the same. Sometimes she's so active and then other times I don't feel her for ages and it used to worry me, but the midwife says the ten kicks, whenever they occur, that's the important thing. I also have an anterior placenta and apparently this can cushion some movements so I don't feel them.
As for my belly button.. mine is on the verge of popping but has not as yet. It used to be very deep though so it has changed a lot.
Can't believe we are hitting the 30+ weeks. Gone soo fast.