Decrease in movements? Help!

So I'm 27+4 and last week's movements started increasing and getting stronger but yesterday and today I've barely felt her, her kicks are a lot softer and I've only felt her a few times. I had a midwife appointment yesterday and she found the heartbeat straight away and said it was fine. I also told her about it and she said since I feel her mostly at night I shouldn't worry but she didn't kick much last night either. Should I be worried?