I was using Duphastone for the last 4 Months . Till last month i got my periods on correct time . As per my physician i need to have it from 1-10th of every month and i used to get periods on every month 14th also . This month December i didn't get my periods yet . Insted of that white discharge is there which is not at all heavy . Out of my curiosity i have taken Urine test which was invalid and again i gone to clinic to do serum test . That was also negative which hurts me . How long should i wait to check my Pregnancy Test ? Or is it something like , i am not pregnant at all?