Hello,
Tubal ligation and tubal implants are not 100% effective
in preventing
pregnancy. The failure rate depends on method used and several other factors. Breast discharge can be caused by many causes. Pregnancy is one of them. Other causes are use of pills, fluctuating hormones, stimulation of the nipples through sex, underactive thyroid, raised prolactin levels due to prolactinoma, galactocele and early form of breast cancer called carcinoma in situ.