Ah dang! Well not being able to pee after surgery is common but usually resolves rather quickly. Are they leaving it in all weekend? I'm surprised they are not just doing an In and Out catheter. Means they put one in, drain you, take it out. Then hope you can pee. If not then repeat the process. Not a fun process but at least doesn't leave your bladder dependent on the catheter all weekend. Did your surgeon say what he thinks is going on? You get some rest this way and regular help from the nurses at leaset. Hopefully home soon. Good luck and keep us posted.