A member asked:

Is pg blood test taken too early at 4.5 weeks? conception date july 7th, implantation bleeding started at 4 wk. mark, have had light spotting all wk

A doctor has provided 1 answer

Unclear question: 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.

Answered 7/27/2014

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