Feels different to walk

I’m 33 weeks pregnant and it’s starting to feel differently to walk. My hips and waist feel like there spreading, and my back hurts. I feel like I’m waddling 😂 does this mean I’m getting ready to drop? I also have polyhydraminos, but I’m not sure it could cause it. I don’t remember feeling like this with my first pregnancy, but maybe I just don’t remember.