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Previous missed periods along with shorter and lighter periods could be suggestive of pregnancy.
Look out for other symptoms suggestive of early pregnancy like fatigue, nausea, constipation, increased sleep, hunger and tiredness, mood changes, headaches, back pain, lower abdominal cramps, increased frequency of urine, breast soreness, nipple sensitivity, food cravings, dizziness. Visit your gynecologist for a thorough examination, blood HCG level test and ultrasound scan to confirm/rule out pregnancy.
Take care.