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test is pretty accurate if done correctly. If you are doubtful you can get your urine tested in a pathology lab also.
There could be other reasons for missing a period- stress
, over exertions, major changes in life (like shifting from a city to another ), Polycystic ovaries
, thyroid conditions (mostly hypothyroidism
An ultrasonogram of the abdomen can be done , and a visit to gynaecologist.