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Eggs are retrieved and then mixed with sperm outside of her body (they are fertilized in vitro). The resulting embryo(s) grow in an incubator for a few days. Embryos are then typically tested, and (usually) one is chosen to be implanted while the rest of the embryos remain frozen for later use.

Not sure I buy “For later use”, This sounds like systematic murder of the unborn, if you hold that life begins at conception.

Oh absolutely. IVF results in the creation and destruction (or death by negligence) of many ooctocytes and blastocysts per cycle and it requires many cycles to get a successful implantation. On a per person basis a woman doing IVF is responsible for the death of many more fertilized eggs than a woman seeking an abortion. It's remarkable that the pro-life movement invests so few resources in convincing women paying thousands of dollars and undergoing unpleasant hormonal therapy to adopt instead.

The 'life at fertilization' position casts a funny light on the reality of human biology where 40-60% of embryos die before being born. If blastocysts are human beings than the leading cause of death is failure to be born, improving access to health care that makes fertilized eggs more likely to be born could become a leading pro-life effective altruist cause. However, older couples may be engaging in reckless oocyte endangerment whenever they have unprotected sex since they are placing a human in an environment where it will almost certainly die.

Does anyone actually think like this? You know I can think of one Rat catholic that might take ideas seriously enough to follow through to that conclusion. But as far as I'm aware, most profilers who believe life begins at conception aren't utilitarians, they're into natural law. They're still going to hate IVF- but they won't really get started on it as a result of the number of zygotes being high, it will be a response to normalization of a practice outside of natural law. Its not a response to the number of zygotes being killed, its a response to the number of people killing the zygotes.