Thanks for writing to HCM
Period may be delayed even in those ladies who have regular periods.Pregnancy
is unlikely due to your act.
You should wait up to next menstrual period.If she misses her 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.
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.