Probiotics are live bacteria, taken as a supplement or in cultured foods, to replenish the good bacteria that normally live in your intestines. A variety of factors including stress, antibiotics and sickness can decrease these beneficial bacteria.

Nurturing and protecting your growing bundle of joy during your first trimester doesn't mean staying inside and being afraid to move. Physical activity prepares your body for the marathon of pregnancy and labor.

Sweet or salty -- junk food can offer you a feeling of comfort or satisfaction. This may be the reason most women crave junk food during the first trimester of pregnancy. While junk food may be okay in moderation during pregnancy, it is not the best food for a pregnant woman to eat.

Exercising the abdominals during the first trimester can cause anxiety for many expecting mothers, especially since the first trimester is such a critical period during pregnancy.

Folic acid is vital for the development of the fetal nervous system. Taking it before conception and throughout the first trimester decreases the risk of having a child born with a neural tube defect. Doctors recommend expectant mothers take 400 mcg of folic acid daily before conception and during the first trimester.

Your digestive tract experiences some significant changes during pregnancy. Perhaps the most dramatic occur late in pregnancy when your developing baby compresses your stomach and intestine. Your first trimester, however, isn't without its own share of digestive changes.

When you are pregnant, your vitamin and mineral needs increase to meet both your needs and the needs of your growing fetus. It is important to follow a healthy, balanced diet to make sure you meet those needs.

Caffeine is a stimulant molecule found in coffee, tea, and many sodas. While it's popular as a pick-me-up and increases attention and alertness, it may also have a negative effect upon your ability to become pregnant or in developing a healthy baby.

A miscarriage is the loss of a fetus before the 20th week of pregnancy. If the pregnancy ends after the 20th week, it is called a preterm delivery. A miscarriage can also be referred to as a spontaneous abortion, but it happens from natural causes and not from a medical or surgical procedure.

During pregnancy, many common foods and beverages can cause unanticipated problems for the expectant mother or her unborn baby. The American Pregnancy Association advises pregnant women to avoid undercooked meats, undercooked eggs, caffeine, soft cheeses, raw shellfish and many potentially hazardous seafood dishes.

By the second trimester of your pregnancy, the worst of your morning sickness should be behind you, if you experienced it at all, according to the website SheKnows Baby & Pregnancy. In your second trimester, you should be gaining the most weight of your entire pregnancy.

During the third and final trimester of your pregnancy, your baby grows quickly. His eyes, bones, organs, brain and lungs are developing and his nutritional needs are increasing. In addition to his rapid growth, your body is preparing to give birth.