@KeflavikAirport
The first case of nontuplets on Wiki is from 1971 and therefore predates IVF, so it is possible. Obviously if it’s natural it’s extremely rare, but rare stuff does happen.
That's Clomid-related. It was released to the market in 1967.
To not have had any fertility treatment at all, this woman would have had to have had 3 eggs drop at the same time (vanishingly unlikely) and for those three to divide into 3. So three sets of triplets.
Once again, this is nothing to do with ivf. IVF has low success rates because implanting embryos runs a high risk of rejection. A woman with normal fertility who takes drugs to increase egg release however, is very likely to conceive several embryos. In most situations a) it's not given to fertile women; b) the administration of the drug is strictly limited by doctors to avoid this type of scenario and c) the recipients are either women who have fertility problems or who have no partner so are using a sperm donor.
Any fertile woman who takes Clomid and has regular unprotected sex could produce multiple foetuses. It's not magical or miraculous. It's a misuse of drugs.