Baby movement or something else?

I’m 17+2 today and tonight I’ve been experiencing a pretty consistent/constant mild trembling feeling in my lower uterus. They aren’t “moments” - it’s consistent/quite constant - Whenever I sit/lay on the couch. If I imagine my uterus as a circle it feels like it’s the bottom half of the circle. Is this the baby moving or something else?

I thought quickening would be momentary feelings, which I’ve had this past week, but tonight this trembling/mild vibration feeling is constant (like 10 mins plus).

I had a scan at 16+3 and baby girl was looking great! Just want her to be doing ok in there 💕