39+1... do movements slow down close to labour?

Katie • Expecting my rainbow baby Jan 2017 ❤️
Only felt my little girl move for around 15 mins at 3:30pm today, it's now 8:40. I've been laid down on my left side for half an hour after having a cold sweet drink, still nothing. I've already been in for reduced movement 3 times and already had 2 growth scans which showed her to be perfectly fine. I should feel 10 movements in 2 hours shouldn't I? Wondering whether to go in again but don't want to feel like I'm wasting their time. First two times were fine then the second time they kept me in because baby's baseline was very low with no movements for ages and then it went up so I ended up being there for 6 hours. What should I do?? :/