Yorvik
I was fortunate to be 99 percent dry a few days after catheter removal learning to tense those pelvic floor muscles when standing was the first thing I managed to master. Can you stop your flow mid stream, if yes it is a good indication that the mechanics are okay.
Follow on treatment for me meant I lost and regained my continence numerous times. My surgeon was quite annoyed that I had started using the sheath system. The sheaths can improve your quality of life and used as an "aid" to recovery they are good, but I suspect your consultant would say it is way to early to be using them. They do have issues and can leak.
I often hear advice that three sessions a day is about right. I used an app that is no longer available, I think the current app is call squeezy, sure someone will advise.
Are you getting free pads from the NHS.
I got myself padded up with a tena2 and stood in the bath to see how much the pad would hold. A sudden gush of 150 will probably finish up down your leg. If you can slow it down it may hold the 150ml.
Its very early days, you still need time to heal and there could be debris etc in the urethra.
It is early days so stick with it.
Thanks Chris