The pressure you are feeling is more than likely due to the position of your baby.
It is not unusual for your baby to put his head/foot/hand/bum down into your pelvis.
The baby’s movements are often not as strong as your pregnancy progresses. Also your baby needs rest and some days he/she will not move as much as other days.
Without seeing you I can not tell you exactly what is going on so just to make sure that everything is ok I would suggest that you get checked out.