Hello
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 :
Anxiety, stress, emotional upheavals
Rapid fluctuations in weight
Thyroid / adrenal hormone imbalance
Polycystic ovaries
Thickening of the lining of the uterus
Hormonal preparations / medications.
Get an evaluation for these.
Take care.