I had a tubal preg & yes my back was killing me & it felt like I needed to have a bowel movement all the time. I was 3mths before I went to the emergency room & my tube had ruptured, so if you think that you are you need to go immediately because you could be bleeding enternally & not know it. Hi, Yes you do have severe pain with tubal and etopic pregnancies. If you suspect you have a tubal then go to A&E now as tubals are dangerous. Good luck.