when will baby move up?

Aubrey🌺
So I have been feeling the baby move, lots and lots. I was wondering though when the baby migrates up more into the stomach area? I'm 21 weeks and 2 days and all the movements I feel are super low down, even when I went to find out the gender she wouldn't get out of my pelvic area. I'm a ftm so I've been trying to be patient with everything since I know it takes longer for stuff to happen then with someone with more than one child. Just wondering when it happens, I get round ligament pain fairly often so I know my uterus is doing something lol