Your position assumes that the unborn are unworthy of due process or the equal protection of the law. There's nothing in the Constitution to either make that assumption or make the opposite assumption that the unborn are worthy of due process and the equal protection of the law. Without a textual basis to make that decision, the Court should have left the decision to the legislative branch to make.
The suggestion that there is a plausible reading of the 14th that includes "unborn persons" in the category of persons entitled to due process and equal protection is absurd. Nowhere in the 14th is the word "persons" interpreted to include fetuses — pregnant women are not counted as two people when apportioning representatives by "counting the whole number of persons in each State," and the Citizenship Clause explicitly reserves citizenship to persons born in the US.
There is also nothing in the historical record to suggest that the authors of the 14th intended it to extend to "unborn persons," and there is certainly no precedent supporting that reading. Positioning those as as two equally valid (or even remotely comparable) readings of the document requires a particularly blinkered textualism, in the process producing a far more expansive interpretation of the 14th than what is relied on in Blackmun's opinion in Roe (to say nothing of the even more restrictive view advocated by White in dissent).
Nowhere in the Constitution is the term person defined, indeed under the law as interpreted today, you don't even have to be human being to be a person. While "corporations are people too" is bad politics, it is good law.
By your argument, Ginsburg was wrong in her briefs in cases such as
Reed v. Reed. After all, there's nothing in the historical record to suggest that the authors of the 14th Amendment intended it to extend to women. Indeed, when Congress was discussing the Reconstruction Amendments, there was discussion about explicitly addressing women's rights, and doing so was flatly rejected.
Your argument about the Citizenship Clause is nonsense. The Citizenship Clause only establishes a minimum standard, which Congress can extend to others using its Article I Section 8 powers, for who is a citizen and thus by extension a person. While all citizens are persons, it is definitely not the case that only citizens are persons. If that were the case, then noncitizens would have no Constitutional rights. I doubt that anyone on here other a few trolls would argue that noncitizens should be denied Constitutional rights. Moreover, even if one were to accept your Citizenship Clause argument, then the Federal government could enact nationwide restrictions against abortion by using its power over naturalization in Article I Section 8 to extend citizenship to the unborn.