At which week you manage feel baby's kicks/movement? What are the factors that contribute to the detection of the movement as some mummies they are able to feel earlier compare to others?

I felt my boy at about 17 weeks I think. On some days I get paranoid if I feel nothing so I'll lay down very still and will feel reassured if I can feel just the littlest kick from him. I guess it varies from person to person? I don't remember feeling my older daughter at all up until the last few weeks to delivery.