In pregnancy week four, unborn baby will be implanting, in a furious manner, into the linings of the uterine wall for ensuring that it has a safe and secured home for the next thirty six to forty weeks! Fetal growth by and large is still in the primitive stages at this point of time but by this time, the blastocyst or ball of cells (yes, it is nothing but your baby) would be planting deeper and deeper in the linings of the uterus. The amniotic cavity is getting formed and the placenta is beginning to form.

As expecting mother continues to grow and expand during her pregnancy week by week, the placenta helps nourishing and supporting the baby during the nine months of gestational period. It comprises of vascular network and blood from mother’s body that helps transporting the oxygen and nutrients to the embryo. There are many different layers of cells that develop in mother’s body that eventually develops into the baby's organs and other bodily parts. Other layers form the nervous system that also includes the brain.

Pregnancy week four , oftentimes, is noted as the starting of the embryonic period and it is during pregnancy at forth week, the infant’s organs will begin forming. The early weeks of pregnancy are said to be a critical time for the growth and nourishment. Any exposure to harmful substance during this period or later in the first trimester is almost likely to bring severe damage to or hurt the developing embryo.

It is very important that the mother do everything possible trying to fend off exposures to any potential pollutants or toxins during pregnancy week four. One should inform her health care provider if she has been exposed to any potentially hazardous substance, which may affect fetus’ growth. One should also remember that the most common substances entailed in fetal deformity or malformation is common toxic substance like alcohol and tobacco.

Drug abuse of any type may also be harmful to the unborn child. If the mother has an addiction, she must talk with her health care professional immediately so they help her determining the best way to treat. The health care professional directs to some support groups so that the mother changes her habits during the highly important period in her entire lifespan.

By the end of pregnancy week four, a pregnant woman normally expects her period to come and if it does not, there are fair chances that she is pregnant! During the early weeks of pregnancy prior to the placenta getting totally formed, an area of the ovary builds something called the Corpus luteum. This usually produces at the site where the ovum has been released from the follicles.

The corpus luteum is considered to be producing progesterone during the early weeks of gestational period. The placenta generally starts producing the majority of progesterone that the mother’s body requires to carrying a pregnancy ideally by about 12th week.

The mother may experience many things during pregnancy at fourth weeks. Some sort of menstrual symptom that includes a bit of nausea and some cramps are common. Believe it or not, some of the pregnant women have cramps those are very bad during this time and are utterly positive that women are about to have their periods, only to discover that they have been actually pregnant a week or so. Most of the women will be able to determine if they are pregnant by 4th week of their pregnancy.

Any sort of home pregnancy tests is sufficient to determine whether or not she is pregnant, especially during pregnancy week four. If she takes a test and finds that she is pregnant, she should call her health care professional to set up her first prenatal consultation. Chances are there that they may not want to see this patient for a few more weeks though, but it is essential however to schedule the consultations. A health care professional may also prescribe some prenatal vitamins if expecting woman is not already taking anyone.

Some women get disappointed finding that their pregnancy tests come back negative but then, one should give it some time though. Some women do not produce enough pregnancy hormones straightaway in order that meets a standard test for detecting a pregnancy.