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If the foetus has been aborted early in pregnancy
there is chance that it gets retained and expelled later from the uterus
which is when the Pregnancy test can come negative. Has your period been delayed. Have you history of heavy bleeding and irregular cycles. If it is not pregnancy it could be hormonal
disorder which can cause similar picture. Kindly get examined by a Gynaecologist who will rule out the causes of your symptoms and find a proper solution to what's going on.