Can a pregnancy test tell you if are week pregnant?

Pregnancy tests detect the presence of human chorionic gonadotropin (hCG) in the urine or blood. hCG is a hormone produced by the placenta after implantation of a fertilized egg. The concentration of hCG rises rapidly in early pregnancy, doubling every two to three days. Most pregnancy tests can detect hCG levels of 25 milli-international units per milliliter (mIU/mL) or higher. This level of hCG is typically reached about 10 days after ovulation and implantation.

Therefore, a pregnancy test can give an accurate result as early as one week after a missed period. However, it is important to note that some pregnancy tests are more sensitive than others, and the accuracy of the test may depend on the brand and the instructions provided by the manufacturer.

If you are trying to conceive and want to get the earliest possible indication of pregnancy, you may want to consider using a more sensitive pregnancy test or having a blood test for hCG.