It is during this early stage of pregnancy when fetal development begins its continuous process of life. After four weeks, your baby is a quarter inch in length, and his digestive system, heart, backbone and spinal cord begin to form.

The embryo, that was the result of a single fertilized egg released by your ovaries, grows up to 10,000 times larger than size it was at the moment of your conception. It is also during the first month of pregnancy when the baby's placenta begins its development.

While the miracle of life is developing inside your body, often your life goes on without even noticing it, but feeling the first symptoms and signs of pregnancy.

Because the fetal development process has just begun, you will begin to experience an increasing fatigue with no apparent cause that is easily coped with extra sleep every day. As soon as you realize that you are pregnant, avoid caffeine, eat well, and avoid stressful situations.

Depression and mood swings are often associated to fatigue in this early stage of pregnancy, occurring in about 10% of all pregnant women, causing lost of interest in your daily activities, changes in your eating patterns and sleep disturbances, among the most noticeable changes.

Your baby begins to grown, leaving behind the embryo state and demanding food that may result in the first pregnancy cravings, although for most women it that the first sign that the new mother notices instead of cravings.

An excess in salivation and urination also occur during the first four weeks of pregnancy, an unpleasant sensation that does not cause harm to you or the fetus, but announce its development.

Meanwhile, your breasts seems to be growing by the minute, and you will probably know that a baby is approaching the first month of pregnancy and the time to provide him with vitamins and other measures will be necessary to compensate the morning sickness and food aversions that you could be experience by then.

After the first four weeks of pregnancy, you must be aware of the fetal development. If the embryo has grown smoothly, there is nothing to worry about. However, if you are suffering from cramps in your stomach or getting occasional spotting, call your doctor immediately.

These symptoms are the way in which the embryo says that something is going wrong. In the early stage of pregnancy, prompt medical attention and an eventual fetal surgery can save yours and your baby's life.