The earliest week to confirm pregnancy through a blood HcG test is typically around 1-2 weeks after conception. However, it is important to note that every woman's body is different and may produce varying levels of the hormone. While some women may be able to detect pregnancy as early as 7-10 days after conception, others may need to wait until they have missed their period for accurate results. Card tests, on the other hand, are designed to detect HcG levels in urine and are generally less sensitive than blood tests. It is recommended to wait until you have missed your period before taking a card test for more reliable results. If you suspect you may be pregnant but are unsure, it is best to consult with your healthcare provider who can advise you on the most appropriate testing method based on your individual circumstances.