What to expect in the fifth week of pregnancy and what symptoms may accompany it? What are the standards for the size of the gestational sac and embryo? Should we worry about ovarian pain or brown spotting in the 5th week of pregnancy?
The fifth week of pregnancy is primarily the time of the first medical examinations, which can 100 percent. confirm pregnancy, and often also determine the approximate date of delivery. Although the symptoms at week 5 are becoming more and more characteristic, you should not worry about their absence.
Pregnancy test at week 5
Pregnancy detection at 5 weeks is possible with a blood test – the beta hCG test . This is a more accurate and reliable test than a self-administered urine pregnancy test – it allows for pregnancy confirmation as early as 7 days after conception.
- The hCG beta test measures the level of one of the 2 components of the chorionic gonadotropin
- Chorionic gonadotrophin is a hormone that is mainly produced during pregnancy - in a certain amount.
- In the 5th week of pregnancy, the level of beta hCG in the blood may reach as high as 7 mIU / ml.
- In a woman who is not pregnant, the norm of beta hCG concentration in the blood plasma is less than 5 mIU / ml.
Therefore, a blood test result above 5 mIU/ml beta hCG allows you to easily confirm pregnancy.
5th week of pregnancy: ultrasound and gynecological examination
The 5th week of pregnancy marks the beginning of the second month of pregnancy – you can then visit your doctor, get a Pap smear (especially if you haven't had one before), and have your first blood pregnancy tests. However, it's okay if the expectant mother undergoes these tests a little later. The first, traditional gynecological examination can detect vaginal loosening, which is one of the symptoms of pregnancy at this stage. A transvaginal ultrasound can also be performed – being 5 weeks pregnant doesn't mean you can see the embryo itself – its size , approximately 2 mm at the end of the 5th week, doesn't allow for this yet. However, the surrounding gestational sac should be clearly visible during a 5-week transvaginal ultrasound.
If the expectant mother remembers the start date of her last period and shares it during her follow-up visit with a transvaginal ultrasound, she may be able to find out her doctor's estimated due date at 5 weeks of pregnancy. It's still too early for a transabdominal ultrasound , so when going for a 5-week ultrasound, you should be prepared for the slightly less comfortable transvaginal one. The size of the embryo at 5 weeks of pregnancy doesn't allow it to be seen on a computer screen.
Fifth week of pregnancy - follicle size (normal)
The gestational sac should already be present in the uterine cavity. The outer layer of cells is the trophoblast, while the center contains the embryo and the yolk sac . The yolk sac is named after egg yolk , containing the most valuable minerals and trace elements necessary for further development.
The follicle size norms at 5 weeks of pregnancy are important because they allow for an assessment of the embryo's development. At the beginning of the 5th week, the normal follicle size is 5 mm, and by the end of the week, it's around 1,1 cm (the embryo itself can reach about 2 mm by the end of the 5th week) . Furthermore, the follicle size norms at 5 weeks and beyond allow for a very accurate assessment of gestational age, if it cannot be calculated otherwise.
It's worth noting that the due date is most often determined by a gynecologist based on the date of the last menstrual period. This also means that in women with irregular periods, the baby may be born slightly later or earlier. The expectant mother can expect to determine the actual gestational age and a more precise due date after the gynecologist measures the baby during a first-trimester ultrasound. The gestational age is also monitored and compared with the current fetal development during second- and third-trimester ultrasounds.
What happens to the embryo in the 5th week of pregnancy?
During this stage, vital organs are forming day by day, and the embryo is growing at a very rapid pace. By the end of the fifth week, if a highly magnified photograph were taken, one could see the limb buds and the outline of the embryo's head with eye buds . At this stage, the spine and vital organs such as the brain and heart begin to form.
It happens, although it is not a rule, that at the end of the 5th week of pregnancy the activity of the heart can be detected , which starts working as the first organ of the embryo.
5 weeks pregnant: what to watch out for?
Although the embryo's size makes it impossible to see even on a transvaginal ultrasound at 5 weeks of pregnancy, this is a time of intense development. During this period, a pregnant woman should especially avoid substances that could be toxic to the baby and its developing organs. This means not only refraining from stimulants but also ensuring the quality and purity of food and avoiding contact with strong chemicals (such as paint and glue fumes).
In this context, it's worth considering using an air purifier , which can effectively remove harmful pollutants from the environment, including volatile organic compound particles. This allows expectant mothers to be sure they're breathing clean air, which is crucial for both their health and that of their developing baby.
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Jagna Szulc-Kamińska Midwife, Expert in issuing opinions on utility products at the Institute of Mother and Child
Does the 5th week of pregnancy mean nausea?
It's from the fifth week of pregnancy onward that symptoms become so characteristic that they're usually impossible to miss . Before that, many of them have a psychosomatic origin. Fear of pregnancy or a desire to actually get pregnant can lead to abdominal pain or fatigue being interpreted as symptoms of a different state. In the fifth week of pregnancy, the accompanying symptoms are difficult to mistake for anything else. However, this doesn't mean that the absence of any symptoms is alarming—some expectant mothers may simply not experience them.
Among the symptoms of pregnancy in the fifth week, nausea is most prominent , not just morning sickness – it can occur 24/7 . Often, it's nausea that makes a woman or those around her aware of her pregnancy. Hormonal changes cause the muscles in the lower esophagus to relax, which creates a feeling of nausea and can trigger heartburn. The lack of nausea is certainly not a cause for concern – the expectant mother should be happy that she's not experiencing one of the more bothersome pregnancy symptoms.
Other symptoms at week 5: due to hormonal changes
Hormones produced by a pregnant woman's body also redirect some blood to the abdomen, where it's most needed. As a result, another symptom of pregnancy in the 5th week is a drop in blood pressure , which can cause drowsiness.
Another possible symptom is increased swelling of the body than usual . This also applies to the torso, although the abdomen itself remains the same size. The size of the embryo at 5 weeks of pregnancy does not affect the figure in any way. However, the breasts may appear enlarged due to fluid accumulation in the body. Due to this, as well as hormonal changes, they may be painful or sensitive to touch.
Ovarian pain and spotting in the 5th week of pregnancy
Less common, but not particularly pleasant, symptoms include pain in the ovaries or lower abdomen . During pregnancy, such sensations vary considerably – in the early stages, pain in this area is associated with the embryo implanting in the uterine wall. Remember that fertilization changes the functioning of the entire female body, including the ovaries – ovulation ceases and hormone production is "switched" to the needs of pregnancy . Therefore, mild ovarian pain during pregnancy – in the early stages, which include the fifth week – is not a cause for concern. More serious symptoms (especially severe, cramping pain in the lower abdomen) should be discussed with your doctor during your first pregnancy visit.
Ovarian pain isn't the only symptom that worries many women in the fifth week of pregnancy. Brown spotting is another frequently mentioned problem. This is actually the last time it can be expected, as implantation of the embryo in the uterus usually occurs no later than the fifth week of pregnancy. Spotting occurs due to damage to a blood vessel in the uterine lining during implantation. Pinkish or brown spotting during the fifth week of pregnancy shouldn't be a cause for concern. A worrying symptom is when the blood flow is a bright red.
Consultation:
Ph.D. n. med. prof. IMID Tadeusz Issat - Head of the Obstetrics and Gynecology Clinic at the Institute of Mother and Child;
Maria Krowicka-Wasyl – resident physician during specialization in gynecology and obstetrics, Clinic of Obstetrics and Gynecology at the Institute of Mother and Child.
