It just might be a garden-variety urinary tract infection. If pee is unable to come out at all, it's a urinary-tract blockage, and you need to see a doctor right away. But if it just feels "reluctant" when you go to the bathroom, it could be a UTI. In your shoes, first I'd try drinking cranberry juice a lot, but if that doesn't help anything, call the ob/gyn or your regular doc and get seen.