Baby at 1-3 weeks

Your pregnancy is dated from the start of your last period, although conception usually occurs 2 weeks later. Thus, by time you miss a period, you will probably be 5 weeks pregnant. A full term pregnancy lasts 40 weeks so your estimated date of delivery (EDD) will be 40 weeks from your last menstrual period (LMP).

Development

Approximately 14 days before your period is due, your body releases an egg and the lining of your uterus starts to thicken. It only takes one sperm to fertilize the egg and for the process of growth and development to begin. The tail separates from the head of the sperm as soon as it penetrates the egg, and cell division begins and develop to form the zygote. Approximately 4 days after fertilization it is a solid cluster of cells, called a morula.

About a week after fertilization, the balls of cells now hollow in the center and called a blastocyst reaches the uterus. The blastocyst will attach itself to the wall of your uterus and begin to embed deep into the lining. The process is called implantation. The cluster of cells very quickly produces an outer layer which will develop into the placenta and amniotic sac and an inner layer which will develop into the embryo. The outer layer has root like structures that bury into the lining of the uterus. These become the route by which nutrients and oxygen are transported from your circulation to what will soon be the developing placenta and embryo.

Appearance

This hollow cluster (morula)is microscopic in size. By the time it implants in the uterus at around 10 days it resembles a greyish blackberry and is called blastocyst. This hollow cluster grow and develop into the embryo.

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