Thanks for your query.
As your urine test as well as gynecologist opinion clearly rules out a pregnancy
, do not worry.
You can take the tablets as prescribed for a withdrawal bleed.
Apart from pregnancy, periods are sometimes delayed/ missed due to the following reasons :
, stress, emotional upheavals
Rapid fluctuations in weight
/ adrenal hormone imbalance
Thickening of the lining of the uterus
preparations / medications.
Get an evaluation for these.