Fourteenth Amendment (Section 1 only)
All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside. No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any State deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws.
I'm not sure what exactly you mean when you say that someone has a right "not to become pregnant" under one of these two amendments, but I'm willing to listen to your rationale.
"... nor shall any State deprive any person of life, liberty, or property, without due process of law ..." To force a woman to become pregnant would be tantamount to depriving her of her liberty, and no such law to allow that in process exists, as far as I am aware.
I have seldom dealt with the legaleaze of the abortion issue, so my goat status is glaring, but I shall get back to you on this this evening, AC; I'll be lurking about to hear Luis Gonzalez on FreepRadio, the Banana Republican show.