No symtomp at week 18, cannot feel baby movement

Hi Mommies, I am currently 18 weeks pregnant. But my symtmp stops and I feel very active to work. I cannot feel movement of baby too, where a lot of mommies already felt it. At night very hard to sleep, and keep waking up in between. Is it something I should be worried about? 2 more weeks to visitting doctor, but super worried now :(