In cases of IVF, it does not make much sense to talk about embryonic development for weeks, since embryo culture does not extend beyond day 6-7. In fact, embryos are usually transferred or cryopreserved before one week of evolution.
Once inside the maternal uterus, we can already speak of embryonic development for weeks. In any case, as we have indicated in the previous question, embryonic development lasts until week 8. Therefore, from then on we will coin the term fetal instead of embryonic.
Read the full article on: In vitro embryo culture and development ( 67).
