why does old blood stay after period
It can take a bit longer for the blood to go brown. A few hours. Some months your uterus may also have less or more of this anti-clotting agent, so the time can differ from month to month. In general you can have brown blood before your period starts, after it ended, mid cycle when you ovulate. These are the times when you bleed very lightly, and your cervix is not as open, so it can take a while for the blood to come out.