Sehri wrote: her urine is smelly and looks infectious took her to vet but he said shes fine
She may have a urinary infection, as you suspect. Cats with nerve damage to the tail can have difficulty urinating and emptying their bladder. It is possible her bladder is quite full of urine and not emptying properly. When urine stays in the bladder too long, it becomes stale and can cause a breeding ground for germs, then the cat gets a urinary infection. If she has a urinary infection, she really needs antibiotics. I do not know if you have more than one vet where you live, but you might want to try another vet if possible and see if you can get some antibiotics.
http://www.veterinarypartner.com/Conten ... ourceID=42
You can help a cat to empty her bladder if she is having trouble because of nerve damage. There is a procedure called "expressing the bladder". Basically you squeeze her belly and she urinates. Here is information on expressing the bladder. At the end of the article (scroll to the bottom) you will see many videos demonstrating how to express a cat's bladder.
Sometimes expressing the bladder also causes the cat to poop, because you are squeezing the belly. That would be good if she is constipated. I understand that you might not want to squeeze her belly if you think she is pregnant, but if she is unable to urinate properly and getting an infection, she may not survive to have the kittens so caring for the bladder is more important than worrying about the kittens, much as I hate to say it. I am really hoping she is not pregnant, and the swollen belly you are seeing is a result of a full colon and full bladder because of the nerve damage, but you would probably need an x-ray to see what is really going on. An x-ray would be hugely helpful if there is any place you can get one.
I hope this helps. And I hope you can find another vet who is more helpful, even if you have to take her to another town.