dear dyuti, welcome to hcm.
I can understand the problem ur facing.
First of all Unwanted 72 should be taken within a maximum of 72 hrs after an unprotected sexual intercourse. It is my humble request to you to not make it a habit of taking it very often since these are hormones which may cause changes in your body
and may lead to complications in some.
if the Urine Pregnancy
test gives a negative result, kindly do the test under the supervision of a medically trained professional for the interpretation of the test.
if it still remains negative, its my sincere suggestion to consult the nearest Gynecologist for an expert opinion along with a sonograpical report.
Please do not panic. Prefet "barrier methods" than the hormonal