I'm 38 weeks also Ive been experiancing the exact same thing. After I use the restroom I feel much better. Take a few mins as juliet said to feel better. Totally normal.
Yes definitely, I get this every morning and when I wake up in the middle of the night to use the bathroom. It takes me a good 2 to 3 minutes to feel like myself before walking around. I'm 33 weeks and had it for about 1 month now.