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You can make some nice patterns with the congealed blood in the bag, expect plenty on debris in the next few days.
I am not suggesting you do the following although I did read it on a NHS Urology website. I found if the catheter seemed to blocked lifting the bag above the height of the bladder for a few seconds would free a small blockage. Newer bags seem to have a non return valve I found a gentle squeeze on the bag did the trick.
Have you purchased some rubber gloves for the oh when changing night bags. I got some stick over that from one of our lady members who suggested I should be buy chocolates or flowers, another member came to the rescue and suggested marigolds were gloves and flowers.
Thanks Chris