1 doctor weighed in:

What to do about implantation bleeding and home pregnancy tests.?

1 doctor weighed in
Dr. Gurmukh Singh
Pathology

In brief: See below

Conception, as defined by the generation of a fertilized ovum, occurs within day or so of the sex.
However, it takes about two weeks for the embryo to make enough HCG to produce 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. Use first morning urine and follow instructions for the test carefully. If the result is negative repeat the test in 3-4 days, if you do not get your period by then. Please seek care from a doctor to protect your and your baby's health.

In brief: See below

Conception, as defined by the generation of a fertilized ovum, occurs within day or so of the sex.
However, it takes about two weeks for the embryo to make enough HCG to produce 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. Use first morning urine and follow instructions for the test carefully. If the result is negative repeat the test in 3-4 days, if you do not get your period by then. Please seek care from a doctor to protect your and your baby's health.
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