Implantation Calculator

Your details

Choose natural cycle (ovulation-based) or IVF/FET mode (transfer date-based).
The day you ovulated, confirmed by LH surge, basal temperature rise, or OPK.
Implantation windowWindow calculated
Sep 8, 2026 to Sep 14, 2026

The range of dates when implantation is possible

Most likely daySep 11, 2026
Earliest positive testSep 12, 2026
Reliable test dateSep 16, 2026
Window start (DPO/DPT)6
Window end (DPO/DPT)12
Peak (DPO/DPT)9
9 DPO
  • Ovulation
  • Window opens
  • Peak day
  • Window closes
  • Reliable test

Implantation window: Sep 8, 2026 to Sep 14, 2026.

  • Ovulation date was entered directly. Implantation is most likely around Sep 11, 2026 (9 days past ovulation).
  • A sensitive home pregnancy test (10 mIU/mL) may turn positive as early as Sep 12, 2026.
  • Testing from Sep 16, 2026 (14 DPO, first day of missed period) gives over 97% accuracy.
  • Implantation bleeding - light spotting for 1-2 days - occurs in about 25% of early pregnancies and is often mistaken for a light period.

Next stepTrack any spotting, cramping, breast tenderness or fatigue during the two-week wait. These can be signs of implantation, though many women feel no symptoms at all.

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