Estimate the implantation window — 6 to 12 days after ovulation or conception — with the most likely day in the middle.
Result
How to use this tool
Use the known date, or estimate ovulation for a regular cycle.
Implantation falls between days 6 and 12.
Day 9 is the median in published studies.
Timing alone cannot confirm pregnancy.
Formula & worked example
Ovulation on 1 January 2026 gives an implantation window of 7–13 January 2026, with 10 January (day 9) the most likely day.
Limitations — read this before you rely on it
Population timing window only; it cannot confirm pregnancy or predict outcome. This tool is for education only and is not medical advice. Talk to a clinician about any result that worries you, and never change treatment because of a calculator result.
Frequently asked questions
Usually 6–12 days after ovulation or fertilisation, most often around day 9.
Some people report light spotting or mild cramps, but these symptoms are non-specific and many people feel nothing.
Home pregnancy tests are most reliable from the first day of a missed period; testing during the window often gives false negatives.
Estimate it as about 14 days before the next expected period for a regular cycle, or use the conception date if known.
Later implantation within the window is statistically linked with higher early loss in studies, but timing alone cannot predict an individual outcome.