8-9-year-old girl asked me how I got pregnant, how to answer?

Depends on the relationship. If you are a female parent, it's up to you. Traditional culture tells us that we shouldn't tell her so early. In fact, it is more beneficial to tell her early and avoid many problems. It depends on what you decide. However, if you are not a parent, you can only answer according to tradition. It should be made clear by the girl's parents.