Thanks
@Mermaid2015 aka Mary for sharing your findings!
My general findings after reading science journals and overseas forums:
1. Many overseas clinics refuse to do day3 transfer even when patients asked for day3 transfer because they want to keep their success rates as high as possible. IVF is a competitive lucrative business and they have to submit their success statistics to a govermnent board yearly.
2. Day5 transfers produce significantly more boy babies rather than gal babies than day3 transfers and natural births, so I deduce that some gal embryos who can survive in womb, cannot survive till day5 in the lab.
3. Grading is surface and do not tell you about the chromosomes normal or not. Several ladies who sent their day5 embryos for PGD found their 4AA embryos to be abnormal while lower grade ones are normal.
4. People with high NK cells rarely get sick, sick only once in every few years.
5. Development before day3 depends on egg quality, whereas development beyond day5 depends on the sperm quality.
Lastly, everything is still up to mother nature. What happen to other patients may not happen to us. Every body is unique.