I would say if then bub continues to move afterwards its ok, eg, youve just woken bub up or soemthing, but if bub is only moving away, then maybe not.

its not about the numbers, its what is normal to you and your bub. was there a time of day bub was most active?? are they still active at that time of day?

other tricks to try is icy cold drink, sitting somewhere really dark, then you can shine a torch on your belly, or even sitting out in the sun exposing your belly. (as bub can distinguish light and dark.

in saying all that, if you are concerned at all, if you think the movement is less GO AND GET CHECKED OUT!!!! better to be safe than sorry and will put you at ease and less stress.