Look, I don't want to freak you out, if you are still feeling movement, I'm sure everything is fine, and it's just craped quarters in there.
Just so you are aware, a good friend of mine was pregnant with her first baby at the same time as I was pregnant with my second. At around 37 weeks, she felt him moving like crazy on one day, like a frenzy- and then nothing the next- really nothing, so not like you, you are still feeling something.
She went to the doctor, they sent her for a scan, and her little boy had died. He was stillborn two days later.
It was absolutely awful.
I'm definately not saying you should freak out, or that this would happen to you, but if you really think your baby's movement is strange, or something feels wrong, trust your instincts, and get checked out - it can't do any harm can it ?.
As pregnancy reaches it's end you've got a whole full-sized new born baby in there, so all his/her movements seem big, you notice all of them, and they are already seetling into sleeping and waking patterns, so sometimes they'll be fast asleep for a couple of hours and you'll lose your mind worrying, only to get "the boot" as soon as you try to get some sleep yourself!
don't panic, but don't feel like you are silly to be concerned, and don't hesitate to get medical advice if you think something's wrong. Even a regular GP can have a quick listen for a heatbeat, and check whether the baby's in any distress. It's no big deal.