If your tubes have been tied then chances or pregnancy due to tubal ligation failure is minimal. At your age if you have missed your period by more than a month, then it is likely that you are experiencing a peri menopausal phase . This can be confirmed by a hormonal profile with FSF & LH values which if found to be raised more than 30 units at day 2 of the cycle, would indicate onset of perimenopausal status.
I hope i have answered your query in detail,
wishing you good health,
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