How long does implantation take after conception?

2-3 weeks: Day 1 is the first day of menses; day 14 is ovulation day; day 28 is implantation day. Depending on the woman's cycle duration and accounting for variability it could be 2-3 weeks. Sometimes, women confuse 2 days of light spotting (implantation bleeding) with a period; when in actuality, their last "real period" was a month prior.

3-5 days.: Conception occurs within 24 hours of ovulation typically and implantation 3-5 days later in most cases. As a result, the most sensitive HCG assays will detect early pregnancy 6-10 days after ovulation - with later implantation of the fertilized egg being associated with decreased likelihood of successful pregnancy outcome.