I would say in the next 2-4 weeks you should really start to feel the baby
I'm 24 weeks and feel movement every now and then but I wouldn't be confident telling her sleep/wake schedule yet.
20 weeks is still kind of early for steady movement. Just to give an example, My cousin and I are pregnant at the same time. I could feel my li
ttle one early on and she could not. At 24 weeks she could not feel her baby much, but I could. Needless to sayI'm in my last 12 days and she is in her last month and we are both expecting healthy babies. Each pregnancy is different, give it another week or two and try not to stress :)