[MarkBsnr]

A human mother generates a new being, so calling her “Mother of God” is both accurate and misleading. The norms break down for a totally unique event.

Question: would an implanted zygote in a female make that female a mother if she carried it to term?

[donmeaker]

That we call such things “surrogate parents”.

Legally, a surrogate mother has mother’s rights until a valid adoption has taken place. A child may have as many as 5 parents, even before you get into such things as gene splicing or gay/lesbian adoptions. The max number will increase as technology is further developed.

egg donor (biological mother)
sperm donor (biological father)
birth donor (gestational mother)
adoptive mother (legal mother)
adoptive father (legal father)