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  Answer     A blood test should be able to pick up the HCG in your blood at about 7 days after conception.     Some pregnancy tests say they can pick up â¦ HCG in your urine from about 7-10 days after conception, but most tests you have to wait to about 14 days-when your period is due.
Implantation usually occurs 5-6 days after conception. So for a blood test I would say it would detect pregnancy around 8 days after conception.A home pregnancy test takes longer to detect HCG because they are only sensitive to a certain amount of HCG, usually 50 and higher.Your HCG doesn't reach 50 until about 13 days after conception and sometimes longer.When a doctor orders a blood pregnancy test they will order a quantitive hcg test...meaning they want to know what your HCG level is at.our HCG doesn't reach 50 until about 13 days after conception and sometimes longer. When a doctor orders a blood pregnancy test they will order a quantitive hcg test...meaning they want to know what your HCG level is at.