How long can implantation bleeding last at 9 weeks pregnant?

At 9 weeks pregnant, implantation bleeding is unlikely since implantation typically occurs around 6 to 12 days after conception, which is much earlier than the 9-week mark. If there is any bleeding at this stage, it may be related to other factors such as hormonal changes or potential concerns that should be discussed with a healthcare provider. Typically, implantation bleeding lasts only a few hours to a couple of days if it occurs. However, any unusual bleeding during pregnancy should be evaluated by a medical professional.