Development The earliest change that can be seen through a vaginal ultrasound at this time will be the “decidual reaction,” which is the thickening of the endometrium.
The endometrium lining thickens as the blastocyst burrows into it.
The development of a baby is quite an intricate process.
From the moment the egg and sperm meet, your baby is beginning to grow.
This early part of development lays the foundation for a healthy pregnancy and delivery.
If a possible complication in early pregnancy is suspected, your health care provider will use a combination of blood tests and ultrasound tests to make a clear diagnosis.
This cannot always be detected by ultrasound—sometimes it may take a special eye or very good equipment to see this “reaction” in the endometrium lining.
Anywhere from day 6 – 12 after conception, the blastocyst will imbed into the uterine lining and begin the embryonic stage.When conception takes place, the sperm will penetrate an egg and create a single set of 46 chromosomes called a zygote – the basis for a new human being.The fertilized egg, called a morula, spends a couple of days traveling through the fallopian tube toward the uterus and dividing into cells (this dividing process is where many chromosomal abnormalities occur).Within this time period, a yolk sac can be seen inside the gestational sac.The yolk sac will be the earliest source of nutrients for the developing fetus.