Embryo implantation in the surrogate mother is exactly the same procedure as in normal IVF cycles. The embryo does not understand if it is in the uterus of the future mother or in the uterus of the surrogate mother. All it needs is for the uterus in which it has been transferred to be receptive, that is, to have the optimum qualities so that it can be implanted in it and continue its development.
Read the full article on: Embryo Implantation: Process and Common Symptoms ( 45).