| We get confused a lot on how pregnancy is | | | | healthy baby. The placenta will begin to form. The |
| calculated. Women do not know the exact date of | | | | placenta is the one that supplies nutrients to the baby. |
| conception so in general, it is determined from the first | | | | On your week four of pregnancy, the three layers |
| day of the last menstrual period. On your week four of | | | | (ectoderm, mesoderm and endoderm) will begin to |
| pregnancy, this is usually the time when you suspect | | | | form the baby's organs and tissues. The first |
| you're pregnant because of a missed period and the | | | | layer-ectoderm will become the nervous system and |
| presence of early signs and symptoms. | | | | this includes the brain, skin, hair, nails, mammary glands, |
| During this time, you may start to notice early | | | | sweat glands and the teeth's enamel. The mesoderm |
| pregnancy symptoms such as breast tenderness, | | | | will become the heart, skeleton, connective tissues, |
| regular headaches, backache and cramping. Most | | | | blood system, urogenital system, muscles and the |
| women are not aware that they are already | | | | circulatory system. The third layer-endoderm will |
| conceiving because the symptoms are very similar to | | | | develop into the lining of the gastrointestinal tract, liver, |
| having a period. They usually find out late or they wait | | | | pancreas and thyroid. It will also house the lungs. Your |
| until they miss one or two periods. Some women on | | | | baby is still very tiny and it measures about 0.078 |
| the other hand may not have any symptoms of | | | | inches in length. |
| pregnancy except for a missed period. | | | | As early as now, start looking for a health care |
| You may also experience fatigue on your week four | | | | provider. You can ask a relative or a friend for some |
| of pregnancy. By this time, your body should start | | | | recommendations. |
| pumping out progesterone, this is needed to grow a | | | | |