Implantation bleeding typically occurs about 6 to 14 days after conception, with most sources indicating a common window around 9 to 12 days post- conception. This bleeding happens when the fertilized egg attaches to the lining of the uterus, causing small blood vessels to break. The bleeding is usually light and short-lived, lasting from a few hours up to three days, and is often mistaken for an early period since it occurs close to the time a menstrual period would be expected. In summary:
- Implantation bleeding starts roughly 6 to 14 days after conception.
- Most commonly around 9 to 12 days after the fertilized egg implants.
- It lasts briefly, usually a few hours to three days.
- The bleeding is light, often pink or brownish, and not heavy like a typical period.
