Because your baby still is not overly big. However, if your baby usually moves alot and isnt moving as much you should speak to your midwife. Also if you are unwell or stressed I've noticed they tend to not move as much. Hope that helps.
I had the same thing happen yesturday after IifTed a lot & went to the Dr and they did a ultrasound the baby was breeched with his butt down and feet by his head so he was still kicking but he was kicking my water. They say that happens a lot. Just depends on babies position. And I'm 27 weeks too
Because your baby still is not overly big. However, if your baby usually moves alot and isnt moving as much you should speak to your midwife. Also if you are unwell or stressed I've noticed they tend to not move as much. Hope that helps.