Movements

I’m 27 weeks and 3 days today and I know the advice is that you should start monitoring your babies movements from 28 weeks but is it normal that some days my baby seems to be bouncing from wall to wall inside me and some days I only feel slight shifts in movements? I will say that I’m not worried about the frequency of his movements I do feel him move multiple times a day but i wanna know why some days it’s so strong and others not so much?

Could this be to do with his position?

Thanks xx