By the time you hit the fifth week, there are no more ‘ifs’ because everything points that you are pregnant. You have missed your period, passed all pregnancy tests, and very high level of HCG (pregnancy hormone) is bringing a wide range of symptoms from prime-breast tenderness and sensitivity to morning sickness. An ultrasound of the fifth week will clear all these estimations and guesses because it can detect the growing baby.
By the fifth week, the baby is growing very rapidly and will be looking like a tadpole (about 5mm) by the end of 7 days. The vital organs that started developing at the close of the 4th week will take an even more recognizable shape. The heart continues growing faster and can be seen in an ultrasound picture at the inner upper end. As the week progresses, the heart shapes into different chambers.
Other rapidly developing organs include the spinal cord and brain that are seen as a neural lobe starting at the upper part and fading immediately. Though the spinal cord and brain are very primitive at this point, they are functional and crucial in guiding other developments. By the close of the week, the skeleton will also begin to form along the spinal cord. However, the skeleton only takes the form of differentiated cells that will grow, multiply, and harden into bones in later trimesters.
Liver cells that started forming in the fourth week become elaborate and play a great role in later developments. The cells help to produce the first red cells of the embryo and also release some pregnancy hormones so that your body can help the baby grow. The liver cells will continue developing and will be able to release most of the pregnancy hormones by the close of the first trimester.
Other embryo developments in this week include reproductive organs that only appear as special cells. By the close of the week, the reproductive cells will start moving down-and outwards from the yolk sac. They will continue developing into testes for boys or ovaries for a girl. However, it is still very early to predict the sex of the baby.
By the close of the 5th week, the baby’s skin has developed and is only one cell thick. This makes the embryo transparent so that all developing organs are easily visible. In the coming weeks, it will develop two layers (one that will be shed off at birth, and another that the baby will be born with).
This is perhaps the week when everything intensifies because the HCG hormone is at its peak. For many pregnant mothers, the changes are so intense and feelings are getting out of control. Some of these include the following:
Because of the high intensity of HCG released into the body system and body changes, make sure to do the following;