"preventing pregnancy" is now equal to abortion ?
and the slippery slope you are riding goes how far ...
by earlier definition there is no pregnancy (conception) until the egg is fertilized
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con·cep·tion
kənˈsepSH(ə)n/
noun
noun: conception; plural noun: conceptions
1.
the action of conceiving a child or of a child being conceived.
"an unfertilized egg before conception"
synonyms: inception of pregnancy, conceiving, fertilization, impregnation, insemination
"from conception until natural death"
the forming or devising of a plan or idea.
"the time between a product's conception and its launch"
synonyms: inception, genesis, origination, creation, invention; More
beginning, origin
"the product's conception"
2.
the way in which something is perceived or regarded.
"our conception of how language relates to reality"
a general notion; an abstract idea.
"the conception of a balance of power"
synonyms: idea, concept, notion, understanding, abstraction; More
theory, hypothesis;
perception, image, impression
"my conception of democracy"
a plan or intention.
"reconstructing Bach's original conceptions"
synonyms: plan, scheme, project, proposal; More
intention, aim, idea
"his original conception"
understanding; ability to imagine.
"he had no conception of politics"
synonyms: understanding, comprehension, appreciation, grasp, knowledge; More
idea, inkling;
informalclue
"they had no conception of our problems"
Origin