I don't think you should take a bath in a tub for awhile. At least for me, my abs were so sore, if I got in the tub, I would surely have ripped something trying to get back out. . .if I could have gotten out. I had to have help getting out of bed the first few days as I had very little strength.
Use a sitz bath, which basically you just soak your butt in a small dish.