Hi!
It is fairly common for women to have irregular periods for awhile after a tubal ligation.
If you were my patient, I would advise you that we could wait for awhile to see if your periods will settle into a regular pattern. I ALWAYS advise a pregnancy test whenever there is irregular bleeding (even after a tubal) although I think that the likelihood of that being the problem is very low. It might be that a short course of progesterone would be
enough to get your bleeding to stop and regulate. If it persists abnormally for more cycles. I would then start a work up with some blood testing for hormone imbalance.
Hope this helps!
Dr B