A 22-year-old female asked:
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i have been having cramping with dark brown/black blood for going on three days. my period is not due for two weeks. pregnancy test said negative.. ?

1 doctor answer
Dr. Gurmukh Singh
48 years experience Pathology
Too soon to test: 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.
Answered on Jan 10, 2015

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