Each pregnancy is a bit different, so you will feel different amounts of movements with each one. Mostly, make sure that you are not seeing a decrease in activity compared to what your little one has been doing in the past, more then comparing them to a previous pregnancy. It is hard not to worry though!
They say that when you don't feel them moving as much they are just resting or sleeping especially at night but I myself wouldn't be worried unless you don't feel her at all for a few days straight but if you are truly concerned ask your dr