Why can’t a fetus be transplanted from one womb to another?
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To elaborate on the significant physical changes the other commenters describe, as soon as a pregnancy begins, there’s hormonal feedback loops that start, for example by secreting human chorionic gonadotropin (this is hypothesized to be a potential cause of morning sickness), and stopping the menstrual cycle in the [luteal phase](https://en.wikipedia.org/wiki/Menstrual_cycle#/media/File:MenstrualCycle2_en.svg). You would have to induce these hormonal changes so that the recipient was at the same “stage” as the donor.
Second, human embryos develop a placenta that is very deeply connected to the mother’s uterine lining compared to most other mammals. Once blood vessel growth begins, you wouldn’t be able to separate the mother and the embryo and have the embryo live.
The only way this could occur is if the fertilized egg were removed before implantation. This would basically be in vitro fertilization, *ultra hard mode*. It wouldn’t be feasible with modern technology, since you can’t tell if someone is pregnant until after implantation has occurred.
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