Indwelling catheter

Hello,

I had a 3-way 20fr catheter put in 3 weeks ago for gross hermaturia. I would see blood in the urine every time I went through an errection episode during nap. I guess the bleeding is from the urethra. Is it normal? I am now afraid from falling as sleeping. I am scheduled to have the Foley removed in a week and the errection problem scares the heck out of me.