You can't argue that it's not a person on the basis of it being alive, or being human, or that it does not have it's own DNA.
Actually, you can argue that it's not human because it wouldn't survive separated from it's body. Therefore it's no more a person than a tonsil or an appendix.
And the proof of that hypocrisy, is that in any other context, you would not support that claim. If for example, a person killed the fetus of an endangered animal, like a Panda, or Tiger or Rhino, you would want them tried.
And I know they probably wouldn't be. But that's a case where the species is in danger, not invididuals.
But the moment you justify murder with the excuse that it is not a 'person', you justify slavery, and genocide. The "it is not a person" excuse is exactly how the Nazis and Slavers supported their actions.
Um, no. The problem is, the Nazis and Slavers didn't have people living in their bodies. The problem with your argument isn't just the dubious assertions that a kidney-bean sized fetus is a person, but that it has MORE rights than the woman it is inside.