Should i call doc?

Ok so im feeling my baby really low and really high and in middle. (Sometimes at same time and sometimes omat diff times) but feeling pressure down low kinda like i need to use bathroom but i dont need to. Ik it sounds silly but im a FTM mom and going on 28w so not sure wats normal and wats not. Plus everything is saying shes around the size of a squash.... idk how big that is... so dont know if the movements r that she is just that big....