Culturing embryos to blastocyst (day five) benefits embryologist in selecting the embryo with the highest potential. As the embryos grow and divide further the cells begin to differentiate into two cell types: trophectoderm cells, these cells surround the embryo and will go on to form the placenta; the second type is the inner cell mass this is a cluster of cells in the embryo which will eventually form the fetus.
On day six the blastocyst will begin to hatch out of the shell and by day seven the blastocyst will attach to the endometrium lining. When the blastocyst hatches it sends signals to the uterus allowing the blastocyst and endometrial lining to interact. This promotes the correct orientation of the blastocyst and for it to move to the endometrium making implantation easier. This can only occur during a certain time period within the course of the cycle and is called ‘implantation window’. By day eight implantation begins and the blastocyst begins to bury in to the lining.
On day nine and ten the blastocyst will continue to bury deeper until completely implanted and starts to form placental and fetal cells. From day eleven the placental cells begin to secret very low levels of HCG in the blood, until it is high enough to be detected on a pregnancy test by day fourteen.
Another commonly asked question is ‘what should I do or avoid after the transfer in order to become pregnant?’
The answer is to carry on as usual; it is best to continue your normal daily routine as much as possible. However, with the exception of vigorous exercise, baths and swimming or anything that may raise your body temperature. As for dietary requirements, well we believe that that a good balanced diet is all that is needed. Remember we have some great information within our fertility spa pages relating to nutrition and relaxation. With this all in mind its best to avoid anything that may make you think “was it due to ….… that I had a negative outcome!”