I agree with the others! If you are having trouble with your bowels then your back pain and rectal bleeding could be from that. I would, however, see your doctor just to make sure everything is ok. Good luck and keep us posted.
Chances are if you have recently had a bowel movement you have developed hemrroids.... If your that concerned with it I would call your Dr.
I bet it has to do with constipation (back pain and bleeding). Have you been able to poop normally? You may need more fiber, fiber pills or stool softener and more water. I would see your dr to make sure and to ease your mind. Feel better!
See your doctor, any bleeding during pregnancy maybe normal or lead to something else. I am also experiencing back pain and im 20 weeks pregnant.