What are the chances of getting pregnant after having tubes tied?

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OK, I have a friend wh had her tubes tied about 10 months ago. She was supposed to get her period on the 8th and still hasn’t gotten it, her period has been regular up til this point. We were wondering what are the chances she could be pregnant?

Extremely unlikely.
They told me "one in 200 in the woman’s lifetime ", so it is possible.It could be a number of things though, so please encourage her to see a Dr.