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If you suspect to be pregnant (or if you do not get your periods within 10 days of expected period dates), you should consider visiting your doctor/gynecologist for a thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). Wait and watch for your periods. Look out for development of any other new symptoms suggestive of early pregnancy. Urine pregnancy test kits are calibrated ones, so unless the hormone levels in urine reach a certain level, they do not show positive results. They can also show false negative results. Blood/serum HCG level estimation is accurate. Drink plenty of water. Take adequate rest. Maintain healthy diet.
Take care.