I've had my period about 6 days and now i'm starting to have dark ..close to black discharge and my stomach is feeling a little funny.. is this normal?

Dark period blood: Dark discharge at day six of your period may be just "old blood", which when oxidized will appear black or like "coffee grounds". This can be due to a clot blocking the release of blood from the womb partially, and allowing the normal red color to turn dark over time. It is probably normal, but see your healthcare provider if it continues.