well it is possible to get pregnant after having a tubal i know because it has happened to me twice once in 2008-09 and i delivered a healthy baby girl in feb of 2009 and i am currently 9 wks due in Aug 2011 with my second baby after tubal ligation. My tubal was performed in correctly they think but there is nothing they can do to fix besides a full tube removal i am jsut lucky that both pregnancies have managed to implant in the right spot.
If u think something is wrong then it never hurts to go and ask ur doctor . I did home pregnacy test on myself and they never came up postive but low and behold everytime we ran the blood work HCG it was really postive ( first on in jun of 08 was 3362 and current one i did at begining of nov was 4612)
That happen to a friend of mine she did not have period for over a year after getting her tubes tied and then she started to hemmagre (sorry can not spell) anyway she went to A&E and was asked if she was pregnant she said no and she went to her dr and they did test and they said she had really low hormmone levels
Its possible BUT rare. Or what they did didn;t take or something.