There was a case either here or in the US, I forget, where a woman conceived 7 babies by taking fertility drugs. Usually a "reduction" would be carried out, I.e. they terminate most of the babies to give two the best chance of survival, but in that case the woman refused the reduction.
I think it's likely that in this case the woman took fertility drugs to stimulate production of eggs, I doubt she would have had 9 eggs implanted via IVF, or that it happened naturally.