Does a dark menstrual cycle mean you could be pregnant?

Acidified blood: A healthy woman of reproductive age can become pregnant any time during her cycle, highest chance being during/around time of ovulation and less so during active menstrual flow. It is difficult to tell exactly when ovulation occurs, hence chance of pregnancy anytime. Darker menstruation just means blood is sitting in vagina longer and acid makes it darker. To be sure, check a hpt. Good luck.