See below: You can see your doctor, who can perform a serum quantitative test. Anything greater than 10 miu/cc HCG indicates pregnancy. The newer home pregnancy tests turn postive up to 72 hours prior to your expected period.
Answered 6/10/2014
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3 weeks: Conception occurs within day or so of the sex. It takes about 3 weeks for the embryo to make enough HCG for a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully.
Answered 1/21/2020
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