hi davis,i hope you are ok since you posted yesterday.
going over 24hrs without having a pee is an emergencey and you need to go to the hospital asap.
my son has kidney damage from an infection/virus a few years ago,now he can only go twice a day but sometimes he goes 24-36hrs if his kidneys are bad.
do you have any bleeding before or after having gone?
i think the pneumonia may have caused a kidney infection.
please see your doctor and get checked out.