Implantation bleeding typically happens about 6 to 14 days after conception or ovulation, with most sources indicating a common window of around 7 to 10 days post-fertilization. This timing coincides with when the fertilized egg attaches to the uterine lining, causing small blood vessels to break and result in light spotting or bleeding

. The bleeding is usually light and short-lived, lasting from a few hours up to about two days. It is often lighter than a normal menstrual period and may appear as pink, brown, or light spotting rather than a heavy flow. Because it occurs near the time a period is expected, implantation bleeding can sometimes be mistaken for a light period

. In summary:

• When: About 6 to 14 days after ovulation or conception, commonly around 7 to 10 days.
• Duration: A few hours to 2 days.
• Appearance: Light spotting, pink or brown discharge, not heavy or clotty.
• Cause: Fertilized egg attaching to the uterine lining, disrupting small blood vessels.

If bleeding is heavier, prolonged, or accompanied by pain, it is advised to consult a healthcare provider as it may indicate other issues