Clue did a Menstrual Cycle Quiz to find out how much people know about the menstrual cycle.
The question this time is: how big is the human egg in millimeters?
Tweet us if you knew the answer!
The human egg, known as the "ovum" is the reproductive cell formed in the ovaries. The egg grows and in a process called "ovulation" is released from the ovary. After ovulation it can be fertilized for up to 24 hours, as it journeys through the fallopian tube towards the uterus.
Read more about the human egg here.
Download Clue to track your period and learn more about your menstrual cycle.