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Absent periods could be suggestive of pregnancy. Sometimes periods are also delayed due to stress, lifestyle changes, changes in food habits, sleep pattern and exercise levels. Wait and watch for periods. Look out for development of any other new symptoms suggestive of pregnancy.
If you are having symptoms suggestive of pregnancy or if you suspect to be pregnant, or if periods do not start within 10 days of expected period dates, consider visiting your doctor/gynecologist for further examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately).
Take care.