20 weeks is early to be worried about movements. Baby's probably just flipped round. Still, just to put your mind at rest have a big glass of ice cold orange juice then lie on your side for half an hour until you can feel something.
I echo everyone's sentiments - 20 weeks is quite early Lie down on your side - with no distractions and concentrate on the baby Drink something cold/ eat ice cream If you still don't feel anything after 30 minutes, give you midwife/dau a call
Ditto advice above. Cold coke.. Chocolate bar. Give it a hour... If you feel something isn't right then call your midwife unit. Most will be happy to help you as you worrying is not good. You can just call them they will tell you what to do next. Hugs op
20 weeks is still quite early! I didn't feel any movements with my first until 24 weeks but I felt flutters from 16 weeks with my second. At this stage movements are still quite weak and it might be easier to miss them especially if you are busy and babies still have plenty of room to move at this stage.
But if you were feeling your baby move regularly and now, not so much contact your midwife to put your mind at ease.
I would have a quiet few days for movement then she would move a lot for a few days etc. caused me so much worry and msny trips to be checked but she was fine every time but it's best to get checked