Ovulation pink marks are pink or white marks that appear around the time of ovulation during a woman's menstrual cycle. This phenomenon usually occurs during the release of eggs from the ovaries into the fallopian tubes and is one of the important signs of pregnancy.

For women who have missed the dangerous period, the appearance of pink marks is a reminder. When a woman is ovulating during the menstrual cycle, her body produces chemicals called prostaglandins. This chemical promotes egg maturation in women and helps the eggs to be released from the ovaries into the fallopian tubes.

When an egg is released from the ovary into the fallopian tube, a woman's body produces a chemical called interleukin-1 (IL-1). This chemical promotes the union of eggs and sperm, helping the sperm enter the fallopian tube and combine with the egg.

Therefore, the appearance of pink marks is one of the important signs of pregnancy. If a woman has missed a dangerous period, or is hoping to get pregnant, she can watch for the appearance of pink marks to alert her that she is ovulating.