Thank you for posting on HCM.Tubal ligation
has no connection with periods directly - but if prior to tubal ligation if you were on birth control pills - it causes periods to get lighter as it is due to with drawl of hormones & once you has tubes tied - naturally you will come off birth control pill & hence periods will be back to your normal body cycles .
Certainly heaviness of this periods needs further tests - blood test
( Iron, FBE, hormonal
tests incl Thyroid
function ) & also you will need to get Ultrasonography
Hope this helps