The side effects of egg donation for recipients are minimal, being the most common the risk of getting pregnant with multiples. It depends on the number of embryos to transfer.
If multiple embryos are transferred, the rates of having a multiple pregnancy shoot up overnight. It should be taken into account that donor eggs have high implantation rates, given the young age of egg donors, which translates into healthier eggs.
On average, the rate of having twins with egg donation is at 36.6%. To reduce this risk, the general recommendation is to bet on single embryo transfers (SET). Two-embryo transfers are advisable only in cases of repeated implantation failure (RIF) or poor embryo quality.