Not known exactly: The embryo gets implanted within 10-14 days of a fruitful intercourse. If the first day of the missed period was feb 23rd, you conceived about two weeks before that the embryo got implanted about 2-5 days before feb 23. Hcg levels are not a good guide to the duration of pregnancy, as there is wide variation in normal results.
Answered 3/10/2014
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