reduced movement

I am 25 weeks pregnant, my baby has been extremely active the last few weeks. Since yesterday she hasn't been moving much at all. I can't tell if what I am feeling is super light movements or gas because I'm so used to her strong kicks.I tried a cold drink and sugary one she's still not moving like she was. I have a Doppler and I found her heart beat yesterday afternoon and before I went to bed last night but i feel like she still just isn't moving very much... what should I do?! Is this normal?