Thanks for writing to HCM
You should wait up to next menstrual period .If you misses your next period then urine pregnancy
test should be done.
Urine pregnancy test depend upon hCG
hormone in urine which is excreted only after fertilization of ovum.Fertilization process take some time.
Generally,Urine pregnancy test is done after missed period for confirmation of pregnancy,but Ultrasound
of pelvis is the investigation of choice for confirmation of pregnancy.It can detect G-sac earliest.
Hope i have answered your query.