Hello, the chances of pregnancy
after tubal ligation
is minimal. However, risk of pregnancy cannot be ruled out even after tubal ligation. Recanalisation (new passage) can be one of the reason for failure. Normally an egg is fertilised by sperm in the fallopian tube
& tubal ligation blocks this & prevents the egg's transport from the ovary.
Tubal ligation is a permanent method of birth control except in rare conditions where it fails due to recanalisation. Tubal ligation does not change the monthly menstrual cycle pattern.
But in your case from what you have mentioned it appears that though your periods had been scanty the question of pregnancy doesn't arise. Because you have not mentioned about having symptoms of pregnancy like breast tenderness, nausea
. These symptoms are experienced within the first few weeks of conception. But still it is better to rule out pregnancy.
Changes in pattern of menstrual cycle (irregular, heavy or scanty flow) occurs in women in perimenopausal age group. Other reasons are utrine fibroids & ovarian cysts.