| I did hun, I lost my appetite at around 22 weeks and it didn't return till about 30 weeks. I'm not sure if it's something to be worried about, but make sure you're still eating, even if you don't feel like it, and plenty of water to keep your fluids up. I never went to GP or anything regarding it, but maybe you should if you're that worried.
As long as you're feeling baby move 10 times from when you wake up until you go to bed then that's fine. He may also not have the energy to be jumping about if you arn't eating properly. If you ever feel like you need to feel him move try eating or drinking something COLD, like ice cold.. Icecubes, icecream etc.
Hth x | 
