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A 32-year-old female asked:

If embryo isn't connected to maternal blood supply until 7days post conception, this would mean hcg isn't yet produced for a urine pregnancy test?

1 doctor answer1 doctor weighed in
Dr. Jay Nemiro
Fertility Medicine 46 years experience
No: The embryo can produce HCG as early as 5 days post fertilization but the amounts are so small and the maternal-fetal blood connections are so minimal that not even a blood test can pick it up, let along a urine pg test that is not positive until your HCG levels are 20 iu/ml or more. You should, however, be able to pick up HCG in a blood test as early as day 9 post ovulation but the levels are low.
Last updated Mar 10, 2019

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