If you have already undergone tubal ligation , the chances of failure in permanent sterilization is very less, even less than 1. However , headache, dizziness and nausea may as well form a part of symptom complex of premenstrual syndrome which mimic early pregnancy symptoms. The white milky discharge per vaginum if not accompanied by itching then its the normal excess physiological discharge , again part of PMS.
Though the best way to rule out pregnancy if the doubt exists is to perform a serum beta hcg test and look for raised levels . If the levels are less than 1 , then pregnancy is ruled out. In that case , the symptoms are possibly due to PMS, indicating that your menses shall resume in few days.
I hope i have answered your query,
wishing you good health,
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