It is very troublesome to calculate the pregnancy cycle after knowing that you are pregnant in the third week of pregnancy, and you have forgotten when your last period was. But at this time, you can also calculate the pregnancy cycle. In the case of irregular menstruation, pregnant women simply can't remember the time of their last menstruation, so it is not reliable to calculate the pregnancy cycle by the time of their last menstruation. Generally speaking, the pregnant period of pregnant women is about 38-42 weeks, plus the difference of menstrual cycle length of each woman and the influence of irregular menstruation, so there will be a difference of one or two weeks, which can be advanced or postponed for one or two weeks.
Irregular menstruation can be calculated according to the date of fetal movement. Under normal circumstances, fetal movement occurs from 18 to the 20th week after pregnancy. If you still don't know how many days you are pregnant, you can observe whether there is fetal movement, and determine the pregnancy cycle through fetal movement, so as to determine the expected date of delivery.
So it is unscientific and inaccurate to calculate the pregnancy time only from the same room. The time of pregnancy is generally calculated from the first day of a woman's last menstruation. Add 9 to the number of months of the last menstrual period during this period, and the result is the number of months of the expected date of delivery. As for the date, you can add 3 to the date of the expected date of delivery. Or through the hospital B-ultrasound examination, the gestational age of fetal head, head and buttocks can be measured by B-ultrasound, so as to calculate the expected date of delivery and pregnancy time.
How to calculate the number of days of pregnancy for 3 weeks? The number of days of pregnancy is calculated from the date of the last menstruation, and has nothing to do with the time of sexual life. The last menstrual period is March 30th, one week later and one month after April 30th next month. Taking folic acid tablets in the first three months of pregnancy can effectively prevent fetal neural tube malformation, pay more attention to rest, don't have sex, and don't be too tired.
Matters needing attention in the third week of pregnancy:
1, to avoid the disadvantages of pregnancy: I have already started to prepare for a lovely baby. At this time, my husband and I have to quit smoking and drinking, because excessive smoking and drinking may lead to abnormal sperm and eggs, and we must not let the baby's life start in an abnormal state.
2, ovulation test paper: If you are ready to get pregnant, in the preparation process, ovulation test paper can let expectant mothers accurately grasp the ovulation cycle, but you must learn to use it correctly. Generally speaking, ovulation test paper needs to be used continuously for 5 days, and the best time for testing is from 10 to 8 pm every morning.
3. Folic acid supplementation: Folic acid is closely related to the development of fetal neural tube. If you plan to have a baby, you should start to supplement folic acid from the third month before pregnancy. The daily requirement of folic acid is 600 to 800 micrograms. Remember to check the dosage of folic acid tablets before buying, and choose folic acid supplements for pregnant women. Don't buy them wrong.
4, supplementary nutrition: to prepare for pregnancy, you can eat more nutrients with less storage in the body, such as foods rich in zinc, iron, calcium and so on. To lay a material foundation for the normal development of early embryos. Fathers-to-be can eat more foods rich in zinc and amino acids, such as eel, loach, pigeon, oyster and leek, because these foods help to form high-quality sperm.