Weekly calculation during pregnancy confuses my patients from time to time. And the beginning of pregnancy from the first day of the last menstruation… This confusion of concepts can lead to disagreements about calculating the gestational week. Yes, of course, pregnancy does not start on the first day of the last menstrual period. In fact, although it differs from person to person, it usually starts 15 days after the fertilization of the egg. However, all pregnancy week calculation tables, all ultrasound devices start pregnancy from the first day of the last menstruation. This is because pregnancy is considered 40 weeks, or 280 days. Thus, a standardization is made to the duration of pregnancy and the week of pregnancy. In other words, whatever your calculated week of pregnancy is, you are as many weeks pregnant wherever you go in the world.
Isn’t the gestation period 9 months and 10 days?
Yes. 40 weeks is equivalent to 280 days. That’s 9 months and 10 days.
1. MONTH= 1-5 weeks
2.MONTH= 5-9 weeks
3.MONTH= 9-13 weeks
4. MONTH= 13-17 weeks
5.MONTH= 17-21 weeks
6. MONTH= 21-25 weeks
7. MONTH= 25-29 weeks
8. MONTH= 25-33 weeks
9. MONTH= 33-37 weeks
After 40 weeks = 280 days = 9 months and 10 days.
How many months pregnant am I?
A problem often arises in this question. It is mixed or mixed. Even if it is used to calculate the pregnancy in weeks, the pregnant woman can be asked how many months pregnant are you? or he may wonder himself; How many months pregnant am I? How many months are over? How many months have I entered? Which month is over? Or how many months of my pregnancy month is full. The table above more or less indicates the month and week explanation in pregnancy. If I explain again;
4-5 weeks pregnant 1 month
8-9 weeks pregnant 2 months
12-13 weeks pregnant 3 months
17-18 weeks pregnant 4 months
21-22 weeks pregnant 5 months
25-26 weeks pregnant 6 months
28-30 weeks pregnant 7 months
34-35 weeks of pregnancy 8 months
38-39 weeks of pregnancy 9 months
40 weeks of pregnancy, 9 months and 10 days of gestation has expired. Birth is now expected.
How many weeks pregnant am I?
If the last menstrual period is known, it is relatively easy to calculate the gestational week. Let’s say the first day of the last menstrual period coincided with Sunday; on the next Sunday, 7 days, that is, a week, will pass and the gestational age will increase by one more week. Let’s say that the first day of your last period falls on a Sunday, and you are 8 weeks pregnant on the Sunday eight weeks later. Three days passed on Wednesday the following week and voilaaa!! You are 8 weeks and three days pregnant.
Thankfully, there are pregnancy week calculation tables and there is no need to worry too much about this issue.
When is the estimated date of birth?
You can find out the estimated date of birth of your baby by using our estimated date of birth calculation table. The date you find using this table may still not be an exact date. Some babies may decide to arrive 2-3 weeks before or 10-15 days after this date. To generalize, delivery usually occurs between 38 and 42 weeks. This is usually not a problem in a closely monitored pregnancy.
What if the last menstrual period is unknown?
I don’t know my last menstrual period. The number of pregnant women who say they don’t remember my last menstrual period is too high to be underestimated. In such cases, ultrasound comes to our rescue. Measurements made in ultrasound examinations in the first trimester of pregnancy are quite reliable. Provided that the measurement or measurements are made in accordance with the rules and correctly, with an error margin of +/- 3 days, if we say it in everyday language, the gestational week is calculated correctly. With an average calculation to be made by taking recurrent ultrasound examinations into account, both the gestational week and the expected delivery date are calculated with little or no error. The margin of error increases significantly in ultrasound examinations performed in advanced weeks of pregnancy, that is, after the first three months. Measurements made during these weeks are less reliable.
Therefore, I always say, I will say it again; If you are considering pregnancy, determine the doctor you intend to have your pregnancy follow-up before you become pregnant. You should go to the doctor you choose at least 3 months before you stop using contraception so that the necessary precautions for a healthy pregnancy can be taken in advance. If you choose a physician who offers reliable consultancy services with up-to-date information on pregnancy preparation and pregnancy follow-up, all you have to do is leave the matter to the specialist, sit back and enjoy the pregnancy. Do research on the issues to be considered in choosing a doctor and be sure of your priorities in choosing a doctor. Your last-minute choices may cause you to change doctors frequently, which may prevent your pregnancy from being followed up properly. As soon as you learn that you are pregnant, contact the obstetrician you have determined. Because even if you are sure of your last menstrual period, the gestational week based on the last menstrual period may not be the same as the gestational week that appears after the ultrasound examination. You ask why? Because during that period, menstrual irregularity may have developed or the ovulation day may have occurred late. You may also confuse implantation bleeding, called spotting, with menstruation, which is not uncommon.