Thanks for the query
HPT tests are reliable, that too when done after missing the cycles. It is not possible for so many tests to go wrong and give a negative value, you may wish to reconfirm with a beta hCG blood test which is more specific.The symptoms you have described could mostly be due to premenstrual syndrome, indicative of a soon approaching cycle. Kindly consult a gynecologist in case you do not resume your cycle in weeks time
Hope this helped
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