Light-colored spotting in place of a menstrual period is a common sign of implantation bleeding, the process that occurs when a fertilized egg adheres to the lining of the uterus, according to the American Pregnancy Asso... More »

As Baby Center points out, newly-pregnant women often experience implantation bleeding when their period is due. This bleeding is usually lighter than a normal period and typically takes the form of light spotting over o... More » Health Women's Health Pregnancy

Spotting, or breakthrough bleeding, in between periods is common, and many women experience it at some point in their lives, according to WebMD. Some light bleeding in between periods is usually not serious, though unusu... More »

The most important role of progesterone is to help ready the lining of the uterus wall for the impending implantation of a fertilized egg, according to WebMD. It is produced by the ovaries when an egg is released and als... More » Health Women's Health Menstruation

According to Mayo Clinic, cramps develop during a woman's menstrual period when the uterus contracts to shed its lining. Hormone-like substances called prostaglandins trigger these contractions, and women with higher lev... More »

Proliferative endometrium refers to the process of the building up of the lining of the uterus just prior to ovulation. Ovulation is the period in the menstrual cycle of a female mammal when an egg is released from the o... More » Health Women's Health Menstruation

According to WebMD, brown-colored spotting in the place of a regular menstrual period can signify possible pregnancy, ovulation, perimenopause or polycystic ovary syndrome. In certain cases, mid-cycle spotting is harmles... More »