@sadsister23 it is impossible to predict beforehand how many egg retrievals or IVF cycles one would need in order to reach a viable pregnancy or live birth, there are a multitude of factors that come into play here. It is VITAL to stress to anyone coming into this journey that this is not exact science…all that egg/embryo freezing can do, at the moment, is to give a better CHANCE/increasing odds of preserving fertility (if done at the right time), a CHANCE of postponing the POSSIBILITY of having a child, if you reach embryo stage and do some expensive tests or believe the grading system then maybe increasing the odds of having a healthy child. But again, none of this is set in stone, nothing can be a guarantee…it is still a flawed system but it is a system that certainly allows you a chance, a chance that you might not have otherwise later in life or for some with health problems, a chance that is only possible with some medical assistance.
Statistically speaking there is a preference to freezing embryos over eggs simply because of defrosting process and also to get a better picture of how your odds stack/how many chances you get to try to get pregnant at a later stage. Egg retrieval is just one piece of the puzzle really, it is “assumed” that the younger you are the chances of eggs being healthier increase…we talk about quality vs quantity of eggs, both tend to deteriorate over time, but all you want are as many chances as possible getting those good quality eggs whilst they still exist. However, that’s not all, once you put egg+sperm together you get another picture, not all will reach embryo/blastocyst stage and some that do are also not suitable for transfer. It is that final number of how many are suitable for transfer that may best answer your question of “how many rounds does one need?!?”…but again, even if you have lots of good embryos you might still not know if that will be “it” as some women struggle with other fertility/health issues that involve implantation, recurring miscarriages, etc. - then you go into another sector, is egg/sperm donation a possibility, would you consider having a surrogate if your body can’t support pregnancy?!?
I think this is a lot of information and I’m glad you are taking the time to educate yourself a bit. Ultimately, whatever decision you decide to make, at least you know that knowledge is power and you can have peace of mind making a conscious choice about the topic.