You are correct. Bearing down activates the sling. Squeezing the pelvic muscles can sometimes stop the stream. It is probably not a good idea to interrupt urination once you have atarted and there is more left to go. Voiding every 3 hours is considered normal, but if you are going more than you are used to, then certainly get yourself checked for a bladder infection. Slow stream often happens after sling surgery, because the sling often alters the bladder/urethral anatomy. However, you still should beable to completely empty your bladder.
Dr. Hoyte