During this period, the fertilized egg moves along the fallopian tube, implantation of the fertilized egg directly into the uterine cavity occurs at the end of the 3rd week.
Some women may see dark brown vaginal discharge, but do not worry, this is normal and will not pose any threat to your unborn baby.
In the third week, the immune system begins to change. Long live the new life!
After fertilization, the future embryo is actively developing, a large amount will grow from a single cell, in the form of mulberry. The cells grow and divide actively, and are firmly embedded in the wall of the uterus.
In general, this is not even an embryo, but a fertilized zygote that is on its way to the uterine cavity, and is called a morula.
During this period, embryogenesis begins, that is, to develop the internal organs and the entire body of your unborn child. At the end of the third week, the morula adheres to the wall of the uterus and your baby can be called an embryo.
Ultrasound at 3 weeks of gestation.
It is still impossible to diagnose pregnancy at this time, the zygote is still too small. But at the end of the week you can see the implantation site of the embryo in the uterus.
The endometrium thickens noticeably.
During ultrasound, the size of the corpus luteum is measured, which should normally vary from 10 to 30 mm. Deviations from these dimensions are indications for a more complete examination.
With the large sizes of the corpus luteum, experts find a cyst in it is a benign formation of a temporary nature that is resolved in the second trimester of pregnancy or immediately after birth, this occurs naturally.
With a smaller size of the corpus luteum, there is a risk that it will not release the necessary amount of progesterone, which can cause a miscarriage.
What happens in your body in week 3?
The organism of the future mother begins to change actively, physiologically begins to increase the uterus and the mammary glands. The weight gain may not be, since this is only the first week of pregnancy.
During this period comes the luteal phase (LF) of the menstrual cycle, also known as the corpus luteum phase. At the end of the luteal phase, the development of pregnancy or menstruation, depends on whether the ovum has been fertilized or not.
The follicle after the release of a mature egg becomes a yellow body.
The corpus luteum is a temporary gland that is designed to produce progesterone. Progesterone, in turn, prepares the uterus for a possible pregnancy and is also responsible for its preservation. The luteal phase also performs a secretory function, which consists of developing a special nutritional secret, which is necessary for the development and growth of the embryo.
Elevated levels of estrogen and progesterone cause swelling in the sinuses due to dilation of the breast ducts.
If fertilization of the ovule does not occur, then the corpus luteum undergoes resorption, the level of progesterone and estrogen decreases, this occurs between 10 and 12 days after ovulation. When a fall in the level of hormones reaches a certain point, menstruation begins, this is facilitated by an increase in the number of prostaglandins, which cause vasospasm and contraction of the uterus.
In the presence of an ovum fertilized with the support of human chorionic gonadotropin, the corpus luteum continues to function, in addition to producing the hormones necessary for pregnancy.
Your feelings in week 3
The expectant mother may begin to feel a little nausea in the morning, there are signs of drooling. Frequent mood swings and changes in taste preferences may also be present.
It may attract the lower part of the abdomen and hurt the chest, but do not worry about this, since the pain in the uterus is due to its increase. The increase of the appetite is a frequent symptom in the first weeks of pregnancy.
All the above symptoms may not be, since each organism is individual.
Discharge of the genital tract
At the end of the third week, a yellowish-brown or whitish-yellowish vaginal discharge may appear, which is called an implant. When zygotes are implanted in the uterine mucosa, small blood vessels can be damaged, as a result of which microcirculation occurs. By nature, such secretions are very rare and often have a light pink color.
They should not worry you, but if you are very worried, contact your gynecologist to have it examined.