What are some very early symptoms of pregnancy?

According to WedMD, early symptoms of pregnancy include spotting, cramping, breast changes and fatigue. However, the only way to know if a woman is truly pregnant is to take a pregnancy test.

WebMD explains that spotting and cramping are often confused with the beginning of a period. However, the spots of blood and the cramps are due to the fertilized egg attaching itself to the uterus' wall, and are referred to as implantation bleeding. Hormonal changes can cause breasts to feel heavy, swollen, sore, tingly or tender. The hormone progesterone might cause fatigue, along with low levels of blood pressure, low levels of blood sugar and an increase in blood production.