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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.
Causes of pregnancy-related blood clots include: 1  decreased levels of natural anticoagulants such as total and free protein S, or antithrombin. 2  increased levels of procoagulant proteins such as FVIII, von Willebrand factor and fibrinogen. 3  decreased rate of blood flow, increasing the risk of blood pooling.