The size of the ovum by weeks: the dynamics of pregnancy
Nowadays, there are two main methods by which pregnancy is diagnosed in the early stages and to monitor its development. So, from the first days of delay, you can pass a special test to determine HCG levels (it can be like a normal pregnancy test, and laboratory research). If at home you will only be able to confirm or deny the fact of fertilization and implantation of the egg, in a medical facility you can even with certain accuracy to tell time. Moreover, this dynamic analysis can show whether the normal pregnancy proceeds, not stopped whether the embryo is in development.
Not less reliable is the ultrasound: it can be used to learn about whether there is the threat of spontaneous abortion, whether normally developing baby, and to set the size of the ovum by weeks. Multiple studies over a long period of time allowed to learn about what should be the diameter (based on measurements of length and width) during the first trimester.
Usually see the pregnancy on ultrasound, it is possible not earlier than in 5-7 days after delay of menstruation. At this time the fertilized egg is somewhere in ¼ volume of the uterine cavity, and to ignore it is impossible. But the embryo at this period is almost invisible: its length does not exceed 1.5 mm. Size of the ovum 5 weeks who has reached the age is about 18 mm. However, the possible inaccurate determination of the size, but the error is always small.
Despite the fact that to a one-week delay using ultrasound to detect a fertilized egg fails very rarely, in scientific literature there is information about what should be its diameter. So, the day of the anticipated monthly size of the ovum (4 weeks of pregnancy) is 11 mm. But the baby at this point is not more than 0.5 mm. to Find it, even using the most modern equipment almost impossible.
Because of errors in determining the size on the ultrasound (especially if it will do different experts), many recommend not to check the dimensions of the ovum by weeks, and get tested for HCG. Of course, by the end of the first trimester, the dynamics of growth of this hormone changing, so this study becomes uninformative. But this time with the help of ultrasound diagnosis is possible not only to determine the existence of pregnancy, to find out the size of the ovum by weeks to see the embryo, but also to listen to his heartbeat. This can be done through 17-20 days after the delay. At this time, the diameter of the ovum is about 25 mm, it takes about 1/3 of the internal volume of the uterus.
The longer the gestation, the more details it is possible to consider the future of the child, because it grows every day. At 10 weeks the fertilized egg is already fully occupies the entire cavity of the uterus, and the child clearly visualized the head, torso and limbs.
Often moms-to-be dimensions of the ovum by weeks are not interested in order to correlate them with the results of their ultrasound, they just want to know about how it grows and develops their baby. They are interested in everything: at which time he formed a separate part of the body, when become visible in his movements, what he can do and of course the size of it.