One common early sign of pregnancy is a metallic taste in the mouth. Some women feel as though they're chewing on aluminum foil, while to others, it seems that they have a penny tucked in their cheek.

Human chorionic gonadotropin, or hCG, is a hormone that appears in women during pregnancy. It helps guarantee a developing fetus’s nutrient supply by unleashing energy stored in excess fat cells in a mother’s body, according to the Discovery Health website.

Ultrasounds during pregnancy are used to determine fetal health, position and to find out the sex of the baby if the parents want to know. Some parents also choose to have additional ultrasounds performed in 3-D and 4-D to get a better idea of what the baby looks like before the little one arrives into the world.

Hormones, nerves, blood vessels and muscles work together to create penile erections. These occur throughout a male's life, even during childhood and adolescence. Nocturnal penile tumescence is the medical name for night-time erections among men.

Human chorionic gonadotropin, or hCG, is a hormone medication often administered as an intramuscular injection. Women undergoing fertility treatment often self-administer hCG injections at home or have someone else give them an injection to trigger ovulation or egg maturation.

Many women wonder, when faced with the thought of conceiving or the possibility of pregnancy, whether they can continue to drink alcohol.

Most women know that the use of alcohol during pregnancy can damage the baby, causing low birth weight, diminished ability to thrive, and a set of symptoms collectively called fetal alcohol syndrome. The government recommends that women who are pregnant avoid all alcohol.