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I suggest that you should have a blood pregnancy
test to exclude pregnancy with 100% surety. Also go for a pelvic ultrasound
scan preferably trans-vaginal as this will exclude other pelvic pathologies like ovarian cysts or ectopic pregnancy as a possible cause of your missed period. If both tests are normal & negative for pregnancy you should see a Gynecologist for relevant hormonal
tests. Symptoms are all too non-specific to make any conclusion.