In humans - 9 months.
An embryo grows and develops in a females womb.
Three layers develop in an embryo .
Uterus
it develops from a zygote.
In the womb
The same way that a human embryo or any other mammalian embryo does.
If there was an actual embryo, it was not a false pregnancy.
An embryo grows and develops in a females womb.
The heart begins to beat at the end of 3 weeks. Our 'reptilian brain' develops within the first two months, but our conscious thought does not develop until six months into the pregnancy.
The babies (embryo) heart starts to beat at about 4 weeks.
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in her uterus
Uterus
it develops from a zygote.
In the womb
Three layers develop in an embryo .
If it's a human embryo, about nine months. If you're a mouse embryo, about twenty days. Gestation time in mammals varies species to species, but it's generally safe to say the bigger the animal, the longer the gestation.