You could have a cyst, have you had an ultrasound done on your pelvic area anytime recently? If not please do.
Hello,
Tubal ligation failure chances are less and the irregularity in periods and increase in weight can be due to hypothyroidism also. Symptoms of hypothyroidism are fatigue, depression, weight gain, cold intolerance,dry, coarse hair and skin, constipation
,muscle cramps,decreased concentration,vague aches and pains,menstrual disorders,palpitation and swelling of the legs.
I feel that you should consult a physician and get yourself and your thyroid hormone levels evaluated.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.