I use a great site that I want to share with you - I've added it to the links on the right here.
If you want to see the development of the babies - check it out - we are on day 4 post ovulation so this is what our babies are doing right now:
About four days after fertilization, the morula enters the uterine cavity. Cell division continues, and a cavity known as a blastocele forms in the center of the morula. Cells flatten and compact on the inside of the cavity while the zona pellucida remains the same size. With the appearance of the cavity in the center, the entire structure is now called a blastocyst.
The presence of the blastocyst indicates that two cell types are forming: the embryoblast (inner cell mass on the inside of the blastocele), and the trophoblast (the cells on the outside of the blastocele).
You can see a picture on their website here:
Visible Embryo - day 4
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