Mine definately decreased. At 34.5 weeks they dropped considerably and I was in hosp having ctg every 2 days. At one stage it looked like I was going into labour (according to midwife) but it didnt eventuate luckily. Since then I seem to be in a pattern of bub slowing down and me getting more braxton hicks/period pain for a day and then a day when I feel better and bub is a bit more active again. But only pushing theres no room for much else any more. She has an obvious knee sticking out and sometimes I have gently pressed it and she pushes back which makes me feel better.
So for me it was normal so I hope that helps a bit but like the midwives say its better to pop in for a quick ctg to reassure yourself otherwise you cant stop thinking about it.