How should ‘pregnancy’ be defined?

How should ‘pregnancy’ be defined? By formation of a unique embryo in the fallopian tubes or by implantation of an embrio in the uterus? Explain your answer by giving reasons. Consider implications of your view. (1000 words)(a) be written in clear, cohesive and grammatical English
(b) address, in a straightforward way, the issue raised by the prompt.
(c) contain a bare minimum of quoted material (* AT MOST 10% * of the total number of words of the assignment can be quotation)
(d) be original work (not plagiarized). Please, remember that all papers are run through Turnitin software that checks for originality.