Nowadays, women will undergo ultrasound examination after pregnancy. Ultrasound examination can calculate the time of fertilization between partners, that is, the fertilized egg. Many women are very careless, unable to remember their last menstrual period or their sexual intercourse time. In fact, this is not a big deal, as sexual intercourse time can be detected through ultrasound.
The gestational age is calculated from the first day of the last menstrual period. According to the ultrasound, the length of the fetal bud is converted into centimeters, and adding 6.5 is the gestational age corrected according to the crl. If the cycle is very standard at 28 days and the baby's development is normal, then these two calculations should be the same. But if it is a longer period of mm, even if the baby develops normally, the corrected gestational age will be smaller than the last menstrual period. If the cycle is long but relatively fixed, such as 40 days, then it is 12 days more than 28 days. Basically, subtracting 12 days from the pregnancy days calculated based on the last menstrual period is enough.
The gestational age does not start from the moment the sperm meets the egg for fertilization. But this is not realistic. So medically, the due date starts from the last menstrual period and is 40 weeks later.
Ultrasound is usually used to estimate the time of pregnancy based on the size of the gestational sac. Due to individual factors, which means that everyone's situation after pregnancy is different, there needs to be a reference value, usually based on the development of the embryo and fetus in pregnant women with a normal menstrual cycle of 28-30 days. That is to say, the accurate conception time can be calculated based on the ultrasound results, rather than the actual gestational age based on the time of fertilization.
This article provides a detailed introduction to the method of calculating sexual intercourse time through ultrasound. As a careless woman, if you can't remember your sexual intercourse time or your last menstrual period, you can definitely determine your sexual intercourse time through an ultrasound examination, which is actually very accurate.
