Sometimes its the baby putting pressure on your bladder. I feel like I need to pee once I sit down from just going. Its annoying sometimes. Ask your Dr to make sure its not an infection like ^ she said.
Could be a bladder infection. I kept them with my first. This time around I have only had 1 and I'm 20 weeks now. Drink plenty of water and some cranberry juice. I would also call the doctor and just make sure they don't want to see you. Infections can be bad for the baby also.