Usually movements feel stronger in the bath tub for me.
I'm 20 weeks with twins. They each weigh 10oz right now and i only just started feeling flutters. I figured since there are two id feel it sooner. You should definitely start feeling some flutters any day within the next 3 weeks.
I would say it's normal I got to feel mine till like 21 weeks
Some ladies don't feel their little one move until later (20-22 weeks) especially of you're a ftm. But all it feels like is light gas bubbles try to lay on your back on your bed when it's quiet. You might get something then