IN a test tube baby fertilisation takes in vitro, so from when the mother in whose reproductive tract the embryo will be implantated referred as pregnant?

Dear student, 
Please find below the solution to the asked query        

When fertilization or conception is not possible naturally, doctors prefer to take out and fuse the sperm and ovum inside a test tube in a controlled environment. When the embryo is formed they again transfer it inside the mother’s uterus where it grows normally. Mother is referred to as pregnant after implantation of embryo.

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