see your gynecologist. there are more accurate pregnancy tests and of course an ultrasound. your tubes were not likely just tied but cut burned (cauterized) folded and separated. it is highly highly unusual for them to re-attach and for you to become pregnant. there can be dozens of reasons for you to stop your menses or even feel pregnant. see a specialist and don't try and figure it out yourself.
how can i tell if my tubes came untied? they were tied 15 years ago and i need to know how to tell. i had very heavy periods twice monthly for 3 years and now they have stopped. i am having all the classical signs of pregnancy yet still coming up negative when taking a test. my monthly ended april 27th and none since then. my tubes were tied 15 years ago which i had a ceserian. how to get accurate info on if i may be pregnant?