What is Implantation Bleeding?
Implantation bleeding is light spotting that occurs when a fertilized egg attaches to the uterine lining. This is one of the earliest signs of pregnancy, often occurring right before your expected period.
Unlike a regular period, it is very light and typically lasts only 24–48 hours.
The Timing
Typically occurs 6–12 days after ovulation. If you have a regular 28-day cycle, this usually falls between day 20 and day 26.
Accuracy
This calculator uses biological averages. Factors like stress or late ovulation can shift your window by a few days.
Comparison Guide
| Feature | Implantation | Regular Period |
|---|---|---|
| Flow | Very light (spotting) | Moderate to heavy |
| Color | Pink or light brown | Bright to dark red |
| Duration | 1–2 days max | 4–7 days |
| Clots | None | Common |