Life didn't begin at conception, it began ~3.5 billion years ago, and there's been an unbroken chain of protein replications and living cell divisions ever since.
Mixing genes from 2+ parents was a live patch that produced many branches, but they all still connect back to Protein Zero. This means daisies and diphtheria are just very distant cousins.
Abortion can't be a moral issue unless killing plants and germs is also a moral issue. It has to be seen as a women's health issue.