GKD - movements are the most miraculous feeling but they also strike fear into our hearts too. Big hugs to you - I truly understand... :hugs:

What you need to be mindful of is a change in the movements. By what I hear you say things are the same but you feel that they are not the same as others. Remember that babies are all different. Some are more active, some are less active - some will give you big wallops that bring tears to your eyes (my dd4 was an avid kicker!) my older daughter and son were gentle movers and my last daughter was more of a kicker too.
I had anterior placentas with all of my babies - think of your placenta as a pillow on the front (anterior) of your belly - so this will cushion some of those blows.

If your u/s looked good and your movement pattern hasn't changed I would just relax into it knowing that this little baby has it's own rythum and it is a gentle one!