If you slipped in the shower and fell on your bum, it is important to monitor yourself for any symptoms that may develop. While you currently don't have any pain or bloody discharge, it is still advisable to remain cautious. After a fall, it is possible for symptoms such as pain, swelling, bruising, or even internal injuries to manifest later on. It would be best to observe yourself for the next few days and pay attention to any changes in your condition. If you notice any concerning symptoms or if your pain worsens, it is recommended to consult with your doctor during your scheduled appointment or seek medical attention sooner if necessary.