I thought this deserved to be a topic all on its own, so I am posting this info here as well as where I replied to a question earlier.

Researching the web, I found these sites that would be helpful in answering your questions about getting pregnant after a tubal. I agree that after so many weeks, it would be greatly painful if there were a tubal pregnancy, but in rare instances, a regular pregnancy can happen.

Http://healthresources.Caremark.Com/topic/ topic13025
can I be absolutely sure an egg won't slip through?
Unfortunately, no. About 4 out of 100 women will get pregnant during the first 10 years after their tubes are tied. (an egg has less chance of slipping through if you have your tubes closed by cauterization, or burning.) if you do become pregnant, be sure to see your doctor right away; there's an increased risk that the egg will be implanted in your fallopian tubes or abdomen, rather than in your uterus.
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this site says the exact thing (word for word!):
http://www.Ahealthyme.Com/topic/topic13025
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according to this site, tubal ligation is 99.16% effective, meaning, yes, you can get pregnant.
Http://www.Essure.Com/essurepermanentbirth controlbyconceptus/comparing/essuretuballi gation/tabid/65/default.Aspx
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http://www.Aafp.Org/afp/20030315/1287.Html
failure
while tubal sterilization is intended to permanently prevent conception, failures do occur. Reasons for failure include undetected luteal pregnancy, occlusion of an incorrect structure (most commonly the round ligament), incomplete or inadequate occlusion, slippage of a mechanical device, development of a tuboperitoneal fistula, and spontaneous re-anastomosis or recanalization of the cut ends.11

have a good day!
Sara