Hi, Thanks for the query. The possibility of pregnancy is less in your case as you had tubal ligation. The delay in periods could be due to causes like : - Hormonal changes in perimenopausal stage. - Lifestyle modifications leading to hormonal imbalance. - General conditions like anemia, thyroid hormonal abnormalities, prolactin levels abnormalities etc. So, once consult gynecologist and get examined. If she recommends go for ultrasound, blood sugar levels, hemoglobin estimation, hormonal profile including estrogen, progesterone, LH, FSH, thyroid profile and prolactin levels etc. With this workup the possible cause for your problem can be identified. Then you can take tablets for withdrawal bleeding with your doctor s advice and also the cause for the delayed periods can be treated. Take care.