If a women has her tubes tied,is it possible that she can still come out pregnant?

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There is not an obgyn on this site but to answer your question, yes, it is sometimes possible, although not common.

Usually the procedure is considered permanent, but depending on how it was done, on the rare occasion one of the tubes might reconnect. Some procedures would make it extremely unlikely.

Some women will also choose to have surgery done in an effort to restore their fertility as well, which can be successful... again, often depending on how the tubal ligation was performed to begin with.