When Did I Conceive?
Pregnancy tests check for the presence of the pregnancy hormone, human chorionic gonadotrophin (HCG), in your urine. Your body begins to produce HCG after you conceive.
If you get a positive test result on the first day of your missed period, it's probably about 2 weeks since you conceived.
You can use the pregnancy due date calculator to work out when your baby is due.
More sensitive tests may be able to confirm that you're pregnant from as early as around 8 days after conception.
Some pregnancy tests can give an estimation of when you might have conceived based on the level of HCG in your urine.