Find out when the fertilized egg will implant in your uterus and the earliest date you can take a reliable pregnancy test.
Implantation occurs 6–12 days post-ovulation. hCG detectable ~14 days post-ovulation.
After fertilization, the embryo travels down the fallopian tube over 4–6 days and embeds into the uterine lining — this is implantation. It occurs 6–12 days after ovulation, most commonly on days 8–10 DPO. Once implantation occurs, the embryo begins producing hCG — the hormone detected by pregnancy tests.
| DPO | What's Happening | Possible Signs |
|---|---|---|
| 1–5 DPO | Embryo traveling to uterus | Usually none |
| 6–7 DPO | Implantation beginning | Mild cramping, light spotting |
| 8–10 DPO | Peak implantation window | Spotting, breast tenderness, fatigue |
| 10–12 DPO | hCG rising rapidly | Nausea, frequent urination |
| 14+ DPO | Missed period | 99%+ accurate test result |
Implantation bleeding is lighter (spotting only), shorter (1–3 days), pinkish or brownish, has no clots, and occurs before your expected period date. A period builds in flow, is brighter red, lasts 3–7 days, and arrives on schedule.
Medical Disclaimer: This tool is for educational purposes only. Always consult a healthcare provider for pregnancy confirmation and care.
Implantation is when a fertilized egg (blastocyst) burrows into the lining of the uterus — the moment a pregnancy truly begins. After fertilization in the fallopian tube, the embryo travels toward the uterus over 3–5 days. Implantation then typically occurs 6 to 12 days after ovulation, with the most common window being days 8–10 after ovulation.
Once implantation is complete, the developing embryo begins producing hCG — the hormone detected by pregnancy tests. This is why you can't get a positive pregnancy test until at least 10–12 days after ovulation, even if conception was successful.
After implantation, hCG levels start very low (around 1–5 mIU/mL) and double every 48–72 hours. Most sensitive home pregnancy tests require at least 10–25 mIU/mL to show a positive result. This means you typically need to wait 2–4 days after implantation before a test can detect the pregnancy. For the most reliable result, test on the day your period is expected or after.