I literally went through the same thing during my 22/23rd week, she was very inactive! Try drinking something cold along with what PeedieD said; you're lil babe is prob just relaxing :)
- Jiggle your stomach , drink something cold or lay on your back pull up some baby lullabies and put the music to your stomach and see if it works.
Like she said sometimes babies aren't as active as they are other days but my midwife told me when I started feeling movement that if 24 hours goes by and he doesn't move at all to call them immediately.
Have you felt the baby at all before hand?
babies have lazy days. but if you are worried go up and get checked i just went in a couple days ago for this same thing. my baby was ok. but i needed to put my mind at ease so i went in.