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There are many causes for the delayed period.
Its very important to know your age.
As age approaches to cessation of menses around 40 years there is irregular or delayed periods .
test was negative,you have already taken Meprate
10 mg for 5 days ,you have to wait another 3-4 days to have a withdrawl bleeding or periods.
Must have Thyroid
function &usg done to rule out PCOD