Yes you can pee. If a tampon ever becomes uncomfortable, remove it. Some woman cannot use tampons for various reasons. Make sure you are inserting it correctly and using the right absorbency. If your blood flow is light and you use an absorbency that is for a heavier flow it will be uncomfortable and difficult to insert.
I don't think this is for a man to answer but I'll get my female friends to answer it and I'm very sure they would have a good answer I think I better be going now I hope everything comes out right ok bye y'all.