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MDhealth.com explains that pink period blood is caused when normal discharge mixes with a small amount of blood. This type of bleeding typically occurs between periods and can be a sign of ovulation or the earliest stage of pregnancy. Know More.
Human blood is red because of the iron in the haemoglobin. This gives red blood cells their red colour. Veinous blood is much darker than arterial blood, and your teacher is right that oxygenated (arterial) blood is 'redder' than deoxygenated (veinous) blood. However, human blood is not blue. Some animals do have blue blood though.