Baby movement

I'm 19w 1d today, and I've felt little flutters of movement (or what I think is movement) for about 2 weeks. It hasn't gotten stronger or more frequent, and I only feel like once or twice over the period of a couple days and only when I'm sitting or laying down. A lot of other people on this app seem to be feeling strong and frequent movement of their babies, so I'm worried. My doctor didn't seem to be concerned and said it may not be more obvious until 22+ weeks, but I want other input. Thanks, ladies! 🤰🏻👶🏻