How to calculate the day of conception of the child?
What are the calculation options?
Different methods can be used to calculate the term. But not every calculator is highly reliable.
To independently determine the expected date of the infant, use the following calculations:
- by last month;
- according to the degree of concentration of hCG;
- according to when the woman first felt the stirring of the child;
Many women prefer to personally calculate how long their pregnancy will last. If you make such calculations correctly, the result of the term may be accurate.
How can the monthly calendar help?
Calculation of monthly - simple, affordable and accurate. Helps in establishing the term of carrying a child and determining the date of ovulation.Most women are guided by the latest menstruation.
Determination of the term by the calendar method is performed by specialNegele formula. The principle of forecasting by day is as follows:
- determine on the calendar the date of the last menstrual cycle;
- deduct 3 months;
- add 7 days.
This method guarantees the correct calculation, provided that the cycle is regular. Duration should be 28 days.
Advantages and disadvantages of the ovulation method
There are days when conception is more likely. Therefore, it is possible to determine the duration of pregnancy by ovulation. The conditions under which such a calculator operates remain unchanged: regularity and 28-day cycle. In this case, ovulation should be expected on day 14.
If a woman noted when unprotected sexual intercourse occurred, then she would easily find out when conception occurred. This will calculate the date of the upcoming delivery. Calculate the date of interest on the day of intimacy is quite easy.The disadvantage, which has a similar calculation, is that the accuracy of predictions of the duration of pregnancy remains low.
Errors in determining the time of conception are possible for such reasons:
- Couples (especially if they are planning to conceive) make love 2 to 4 times a week. It is unlikely that a woman knows what sexual intercourse was effective and led to pregnancy.
- Sperm activity persists for at least two days. Some of them manage to maintain the ability to fertilize up to 7 days. This greatly complicates the calculation.
What is hCG research?
Hormone calledhuman chorionic gonadotropin, is a kind of signaling device for pregnancy. This is due to the specific property of the hormone to increase from the fifth day after conception. This factor is used to work rapid tests to determine pregnancy.
In the blood of a pregnant woman every day there is an increase in the level of hCG. In the normal course of pregnancy, this growth ranges from 60 to 100% (within every two to three days after conception occurred).
To calculate when the conception came, use a special scheme:
|Gestational age||HCG index|
|1-2 week||25-156 honey / ml|
|3-4 week||1110-31500 mU / ml|
|from week 5||82300 IU / ml or more|
Analysis of the growth hormone dynamics makes it possible to correctly calculate how long a pregnancy lasts. The laboratory method provides the determination of the duration of pregnancy and the date of delivery at the early stages of a child.
Guaranteed Prediction Techniques
Absolute accuracy is provided by determining the duration of pregnancy, compared with calculators, medical devices. The most truthful are the medical-diagnostic methods for determining the duration of pregnancy: ultrasound examination (as in the photo) and gynecological examination.
During the examination, the gynecologist measures the size of the uterus. In four weeks, it acquires the value of a chicken egg. At 8 weeks - increases in volume and is comparable to a goose egg. It helps to name the date of birth of the child.
The question of how to calculate the duration of pregnancy is effectively solved with the help of hardware methods. Ultrasound is especially shown at 8-12 weeks. High-tech examination is painless and safe.After completing the image analysis, the doctor will inform you of the pregnancy and the approximate date of delivery. Also, the procedure will allow you to get an intrauterine photo of the baby.
Ultrasound may also be wrong. The disadvantage of the method is that there are no standardized indicators of how much the size of the fetus is at different times of pregnancy. These are individual parameters. They can vary significantly in different children, regardless of the expected period.
How true are folk methods?
There is also a physiological method, tested by our grandmothers and great-grandmothers. In the absence of reliable methods, determining the duration of pregnancy and the date of delivery trusted personal feelings. To calculate the time of the child's appearance, future mothers tried according to the first signs of fetal movement.
During the first pregnancy, a woman can feel the movements of the baby in the womb at 18-20 weeks. If she has a similar experience, then she recognizes the baby's stirring in the 16th week of pregnancy.
The definition of the "age" of the fetus according to personal feelings is fraught with gross errors.The period when the baby starts to be active, and mother will notice, is influenced by such factors:
- the mobility of the child;
- what is the tone of the uterus;
- how the intestines work (a woman can take peristalsis as a baby stirring);
- psychological features of the future mother (expectations and false sensations).
A natural calculator cannot be considered seriously. He does not help to know exactly when the conception occurred.
A woman who is preparing for motherhood can try to determine when the pregnancy has come in any way. Some even enter their data into an online calculator. They are not confused that the calculation is made in absentia.
If she wants to know exactly this date, then you need to rely only on the conclusion of a doctor. No calendar calculations and photos taken during the ultrasound will not help in this matter.