degsme - your interpretation of the 4th and 13th amendments as it applies to pregnancy is flawed in many ways, but here are a couple:
1) Pregnancy can easily be considered (except in the case of rape) VOLUNTARY servitude, just like accepting a servant-like role in a marriage or job. All that you have to do is posit that the act of sexual intercourse is an implicit contract with nature, i.e., an understanding that a woman may get pregnant from voluntary unprotected sex. While there are criminal consequences for breaking much less meaningful, and certainly less complicit, contracts (i.e., failing to appear for a served court supoena), it is not hard to successfully argue that a woman who vountarily has sex without contraception is by no means involuntarily conscripted into child bearing.
2) Also, in regards to unreasonable seizures, the state is not taking control of a woman's reproductive organs by criminalizing abortion. Instead it is simply requiring that a woman, whose own control of her organs has been exercised when she allows male reproductive materials to come in contact with those organs, then care for the possibly resulting child from the moment of conception in the same way that current law requires parents to protect their birthed children from neglect and harm.
So - both 4th and 13th amendment arguments are up for interpretation, and this is why a conservatively weighted Supreme Court could easily use re-interpretation to throw out Roe V Wade.
That's why people who really care about preventing abortions don't argue about Constitutional issues. We argue about more practical issues. Such as: Is it reasonable to expect that human beings, with or without conservative religious upbringing, can be convinced to abstain? Answer: Not often enough to prevent a LOT of unwanted pregnancies. Now, is it reasonable to expect that men will submit to the psychological and very real interruption of the actual purpose of their sex drives (to procreate) by using condoms as contraception? Answer: Not often enough to prevent a LOT of unwanted pregnancies.
So it comes down to the very unpopular reality: Women must exercise control of their OWN bodies via abstinence (difficult in too many cases), insistence on condom use (apparenty difficult in too many cases - perhaps due to a woman's own instincive psychological drives with respect to procreation) or the miracle of modern science: Birth control pills or other hormone therapies that do not depend on action at the actual time of intercourse.
Yes, birth control pills have risks, but it is arguably worth those risks in exchange for avoiding the humiliation and physical intrusion of abortion.
If, independent of religion or criminal law, we as a society could make abortion seem as disgusting (and avoidable) as eating your own feces. If every young girl knew that pregnancy prevention medication was available over the counter and as inexpensive as chewing gum, and all sexually active women took it for granted that not taking advantage of such a simple element of protection from pregnancy was as stupid as walking into a tiger cage at a zoo, then we could create a culture without abortion, and without criminalizing it. We could try to convince the very few women, who became pregnant despite this preventative measure and did not want to become mothers yet, that carrying that unlucky accident to term and allowing it to be adopted by those in need was considered heroic by society. We could praise them for this choice, but also understand the very very very few who still chose abortion and pity them for their bad fortune.
Then we could tackle disease prevention (the true domain of condoms and abstinence) and, after every woman was used to using birth control medication until they were ready for motherhood, some intrepid woman or group of women would invent the next miracle: male birth control pills! And then we could work on making sexually active young (and older) men seem just as stupid for not taking their daily dose.