Bladder pain..?

15 weeks pregnant and I’ve tried to google this but I can’t really get an answer. Sometimes when I’m done peeing I feel like my bladder inflates and deflated again. I know that’s not what’s happening but it’s the best way I can describe it. It doesn’t burn and it’s not painful it’s more of an uncomfortable feeling. Also I don’t itch or anything so I’m really unsure of what it is or if it’s normal?