Thanks for the query.
If you have missed you periods and have a negative pregnancy test (which was never positive), then you had heavy bleeding as well for a single day generally rules out pregnancy chances. But if the test has been done less than 7 days of missed or delayed period then better way to confirm or rule out pregnancy is serum beta hCG test, which is a lab-based test and is more sensitiveness specific than the urine pregnancy test.
Hope this helps.
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