5-Day Transfer
| 
Days Past  Transfer (DPT) | 
Embryo Development | 
| 
One | 
The blastocyst begins to hatch out of its shell  | 
| 
Two | 
The blastocyst continues to hatch out of its shell and begins to attach itself to the uterus | 
| 
Three | 
The blastocyst attaches deeper into the uterine lining, beginning implantation  | 
| 
Four | 
Implantation continues | 
| 
Five | 
Implantation is complete, cells that will eventually become the placenta and fetus have begun to develop  | 
| 
Six | 
Human chorionic gonadotropin (hCG) starts to enter the blood stream  | 
| 
Seven | 
Fetal development continues and hCG continues to be secreted  | 
| 
Eight | 
Fetal development continues and hCG continues to be secreted  | 
| 
Nine | 
Levels of hCG are now high enough to detect a pregnancy  | 
 
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