Waking up sore all over

I'm 32.4 week along and some mornings I wake up so sore as if I have been working out the day before. I don't do any strenuous activity to make sense of how sore I feel. It's usually my legs, arms and back. Only thing I can think of is maybe I'm not drinking enough water? I dunno anyone have any ideas, answers or feeling the same way? This is my third and I didn't have this symptom with my first two. 🤔