Percy, I know its hard not to worry, but it is perfectly normal for big full on kicking type movement to reduce because bubs IS running out of room. You should however be feeling regular enough movements. You can always do a 'kick chart' noting down how many movements you have. This is often reassuring because you're recording the movements and can 'see' what's going on.

IF you have any concerns, DO contact your midwife.

I'm sure everything is ok, all the same.