What you're experiencing can be totally normal right after takedown. I had a little blood for a couple of weeks. I also had difficulty emptying. I would strain but nothing would come out or very little would. I had a lot of built up gas inside with constant gurgling noises. When I went for my post op apt my surgeon checked me out and it turned out I had a stricture (scar tissue) at the anastomosis site. Once he dilated it I felt so much better.  definately call your surgeon or you probably have a post op apt already set up. If your pathology report said UC after the colon was out then chances are you don't need to be worrying if it's crohns or not. 

The straining is worth avoiding, if possible, as it can cause problems. What happens if you delay using the toilet until more stool accumulates, and (perhaps) you can poop without straining? At Day 9 you could easily be taking those new sensations to mean that you must go to the toilet, when perhaps you can simply delay. The experiment might turn out messy, and you might have some minor discomfort (e.g. cramping that passes), but it might be more constructive than running to the bathroom so frequently. Your pouch has to mature, and it needs your help.

If the difficulty emptying gets worse, call and make an appointment for sooner if possible. Five weeks is a long time to be feel uncomfortable like that. And especially if the bleeding continues. Good luck!