tubal ligation has failed, chances of a succesful pregnancy?

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A heterotopic pregnancy is a multiple pregnancy with one normal implantation in the uterus and one ectopic pregnancy.

In your case the ectopic pregnancy was probably the result scarring associated with the tubal ligation done previously.

The chances of you conceiving again and having a successful pregnancy, will depend on the patency of the fallopian tube. Since you have been operated earlier, it is likely that you have a obstructive lesion (though rechannelisation has occurred). Hence the possibility of ectopic pregnancies are higher than the actual normal uterine pregnancies.

If you want to conceive again, then you may have to consult with your OBGYN doctor who can do few necessary tests and evaluate the possibility of fallopian tube reconstruction. In case it is not possible then the best alternative is invitro fertilization techniques (assisted reproduction). Such techniques have a better chances of a successful conception and normal pregnancy can continue there on.