Wouldn't that criminalize some forms of birth control? If you define it as before the fertilized zygote is even implanted on the uterine wall...
And don't forget IVF. This would probably criminalize many forms of IVF.
I can't imagine they would be ok with freezing fertilized eggs (blastocysts) if they're considering those to be "people".
My wife and I started with something like 12 fertilized eggs (yes that's alot, and not typical). We got 5 blasts out of those.
Three become our children, one was a negative frozen cycle and the last we donated.
Would all of those "lost" fertilized eggs be considered "murders"? That's crazy.
Something like this would probably put fertility clinics out of business.
So people who don't want kids are forced to have them, and people who want kids are denied an option. Crazy.