Aiyooh, that sounds like ligament pain lah, very common dalam pregnancy especially around that time, a few of us had the same sharp pain kat one side! The urge to pee when you press it might just be because baby's position or your ligaments are pulling near your bladder area, but honestly boleh check with your gynae just to be safe, especially since it's intermittent like that. Don't worry, most of the time it's nothing serious, just your body stretching to make room for baby!