I agree with all the comments above.
And embryos are not "implanted". They are simply transferred and they may or may not implant. So I am not sure if they are saying that, in cases where 2 "robust" embryos are transferred AND both implant, twins result 100% of the time. And did any of those split and become triplets or even quads? Seems like a very strange statistic.
There is nothing you can do to be sure that eggs will be good and will result in embryos that will implant. If there were, everyone would be doing it. There is also no guarantee that you will even have two embryos let alone two "robust" embryos.
Every RE seems to have different recommendations. Mine basically didn't suggest anything to increase odds. I asked about diet and supplements and they didn't have any recommendations of that nature given that I have unexplained infertility. Then I see other people doing dairy free, gluten free, sugar free, caffeine free, alcohol free etc. etc. based on advice. That being said, I did take supplements and did acupuncture which were recommended on here.
My cycles looked like this... At age 36 - 8 eggs retrieved, 6 mature, 5 fertilized. 1 excellent day 5 blast transferred. BFN, nothing to freeze. Next, still age 36 - 11 eggs retrieved, 10 mature, 8 fertilized. 1 excellent 5 day blast transferred which resulted in my son. 4 embryos frozen. At age 39, I transferred the best of the frozen blasts which was also excellent quality and am 25 weeks pregnant.
As mentioned above, people have perfect embryos, genetically screened, and they don't result in pregnancy. Other people have iffy embryos, transferred on day 3 that result in take home babies. It is not an exact science and there are so many factors and unknowns. Embryos could be perfect, but immune issues or lining issues or hormone issues or other issues may prevent a pregnancy from occurring or making it to term.
Stats are great and I love stats too but there is nothing that would account for your exact situation and diagnosis and predict an outcome.
It sounds like you really want twins, perhaps I am wrong, but I would do a lot of research on it. In my family, there have been 4 sets of twins. One pair, things went well. Next were born very early and one was in hospital for months and on oxygen for months more. Next set, born very early, one passed soon after birth. Next set, same mother, same result and remaining twin has cerebral palsy. I am not trying to be mean or scare you or scare anyone currently carrying twins. And I understand that lots of twin pregnancies are relatively uncomplicated, but there are far more things that can go wrong than with a singleton.
I do wish you luck on your journey and hope that you will find success!
Age 40, DH 44 in Oct.
TTC on and off since 2007 before our second IVF, in 2014, brought us our beautiful son and our first FET brought us our second son in 2017. Our family is complete!
IVF #1 - April 2014 - BFN - no frosties
IVF #2 - July 2014 - BFP - 5B-AB and 4 frosties (5B-BB, 2x4B-BB and 3B-BB)
Apr. 13, 2015 - Daniel Erik was born at 5:05 am, weight 8 lbs, 13 oz, and 22" long. He is perfect in every way.
FET #1 - September 2016 - BFP - 5B-BB and 3 frosties (2x4B-BB and 3B-BB)
June 18, 2017 - Matthew William was born at 2:46 am, weight 8 lbs, 11 oz and 21" long. He is perfect in every way too!