RE = Reproductive Endocrinologist (fertility specialist).
:-)
What is an RE? I am still pretty new to these terms.
you shouldn't have to untie your tubes as a pregnancy wouldn't involve your tubes if it's IVF.
I would recommend finding a local re and setting up at least a consult...
best of luck~
If you're doing IVF, I do not believe you need to have your tubes untied. I think it would be a good idea for you and your husband to set up a consultation with an RE. He or she will be able to give you all the information you need to move forward. Good luck!