The majority of fertility doctors concur that your chances of success—that is, becoming pregnant or giving birth—are higher depending on how many eggs you've successfully obtained. Most standard IVF medical professionals continue to prefer fewer eggs, even though some research indicates that success rates level as a very high number of eggs is retrieved (in the middle to high 20s and above) in a single cycle (in minimal stimulation IVF, or mini-stim IVF, doctors are less focused on the quantity of the eggs)

For example, seven eggs obtained are more beneficial than three eggs retrieved, ten eggs retrieved are more valuable than seven eggs retrieved, and thirteen eggs retrieved are preferable to ten eggs recovered. It's good to retrieve 20 or even 30 eggs in high numbers. However, it does show that the woman may have PCOS, previously mentioned, which could mean that her eggs are not equally good compared to those of a woman without the disorder, although this is not constantly the situation.

Not all eggs have the same genetic code; therefore, not all pregnancies, births, or embryos will have the same DNA. Your probability of conceiving a few viable embryos and getting pregnant improves with the number of eggs you have. IVF attrition is related to this process. 

What is IVF Attrition 

The unacceptable but entirely natural process of decreasing chances of success is referred to as IVF attrition. There is a chance of failure at every step of the IVF process, making it an equation of numbers: the more significant number of eggs you have at the start, the greater the probability it will be that you will get one normal embryo that, when all the work is done, results in a healthy pregnancy that gives birth.

What are the next steps afterwards? 

The initial phase is egg retrieval; most women will also have undeveloped eggs retrieved, which are ineffective, along with most mature eggs. Say, for instance, that just fifteen of the nineteen found matured; this corresponds to a loss, or attrition, of four eggs. 

Fertilisation comes after that, so not every egg will become pregnant with a sperm. Around eighty per cent of eggs will fertilise on average, based on the woman's age. Thus, only approximately twelve of your fifteen fully developed eggs may fertilise.

Next comes blastulation: How many of the fertilised eggs, or embryos, will make it to the essential blastocyst stage required for Preimplantation Genetic Testing for Aneuploidy (PGT-A), thereby providing medical professionals with an accurate indication of each embryo's probability of successful reproduction? About 30 to 50 per cent of embryos reach this stage, leaving us with just six.

The PGT-A test refers to ready to start. Which percentage of embryos are going to be expected? Since eggs are paused in transforming from a complete set of genetic material to a half set for combining with sperm, this depends mainly on the woman's age. Over time, the eggs become less skilled at restarting this procedure. Here, too, there is going to be a loss. Assume that only three of your six embryos had the usual tests. Based on evidence, physicians only transfer normal embryos because we know that abnormal eggs frequently result in pregnancy, premature delivery, or a child with a defect.

Implantation is the final stage of attrition. Since roughly 65% of normal embryos lead to pregnancy, a woman carrying an average embryo may still not become pregnant after the first transfer; however, as mentioned earlier, the probability of becoming pregnant with three regular eggs is 95%.

Conclusion 

Ultimately, it's all about the number of eggs you can retrieve, but age plays an important part. Even if a younger woman obtains fewer eggs than she was hoping for, there remains a good chance that her fertilised eggs will cultivate blastula and lead to a normal embryo and pregnancy, as older women tend to produce fewer fertile eggs.