Anyone else just curious...

So I'm 29w1d and at my last ob appt (June 19) my dr said I should start tracking baby movements and if I started having contractions to put my feet up and drink plenty of water and at the time I was only 27w3d (therefore still in my 2nd trimester) and I'm like thinking to myself should I be worried what does this mean is there something wrong none of it made any sense since all my blood work test labs all come back really good...so as I track baby movements I'm wondering to myself how active is too active for a baby to move cause I track by the hour and within 18 hours my little man has moved 400+ times is that a normal number for movements in a days worth or is it too active...any thoughts let me know