It changes nothing I have said.
Did you read my comment about ectopic pregnancies? A womb is not a requirement, the large intestine, or any other organ that has a sufficiently large blood flow will suffice.
Meanwhile, if the blastocyst can not suppress the immune system adequately it can lead to anaphylaxis, and that immune respones to the blastocyst and developing fetus are believed to be the main cause of natural miscrriages.
The leading theory of Pre-eclampsia, a condition that can threaten both the mother and the baby, and can occur anywhere from 20 weeks gestation, to 6 months post natal, is that it is triggered by hypoxia in the placenta, which releases proteins into the mothers bloodstream, which in turn triggers an immune response. But the irony, if it can be called that, in this scenario, is that the hypoxia is beliveed to be caused by shallow implantation of the placenta, which in turn is believed to be cause by the mothers immune response to its implantation - essentially, it's the body rejecting the foreign organism, or at least trying to unsuccessfully.
The simple fact of the matter is that from the maternal perspective, the fetus is a foreign organism/body, with foreign proteins, that draws upon its hosts resources, and provides no tangible return to the host.
Evolutionarily speaking an offspring is a 'return' in it self. Reproduction is a natural system, part of the body. The female body develops certain characteristics that allows her to follow through with it.
The 'fetus' is only foreign because of the mixture of the father and mother, but when it was simply an 'ovule' it was not foreign. The system of fertilization is quite specialized. The protection of the egg and the match with the sperm. Try fertilizing a human egg with a mouse's sperm. Why are eggs produced? Do you know of any benefit of the production of ovules themselves? Does the woman get to eat those ovules alive, I mean are they some fruit waiting to be digested?
All of this 'process' itself is a system developed by the body and is in place. If the fetus is a 'foreign' object other features such as mammary glands and the production of milk make no sense. Have you seen a woman sucking her own milk? It is developed for the forthcoming offspring, and even it if is not, how does it serve the mammals in other ways that they have not lost the mammary glands which basically are used by 'foreign' objects and sucking on them gives no 'return' to the mammal herself.
I'll also recommend reading this for some context about the immune system response, its not that one-sided of a story that the parasitic fetus is doing everything, if the maternal immune system isn't there, than the parasite dies:
http://findarticles.com/p/articles/mi_m1134/is_4_116/ai_n19187208/
Reproducing is a benefit according to evolution. If you don't see a 'return' in that its really taking the whole thing out of natural context.
To be honest, those of us who think that fetus is a foreign object and don't give a shit about it are worst than animals at least they care for their offspring and don't consider them some sort of fucking parasite that sucked the shit out of them.
The woman needs to stop producing eggs, its her body why doesn't she tell it to stop creating those fruits she can't eat and the only use of them is to become some 'foreign' object that gives them no return.
Why the hell are eggs produced in a place like that? Why can sperm reach that egg. What the hell is the point of a male producing sperm?
Hell think of it this way, the 'mother' produces eggs so that it can live on. And come to think of it, why are we giving this 'woman' any sort of 'specialty' when if fact she's just a glob of chemical reactions of multi-cells.
What qualifies her of 'rights'? Its that she is recognized as as individual. She may think that fetus is 'foreign' but natural history tells us that it is a part of her waiting to come out. If you recognize that as life its an individual with those same rights, and it not in some foreign shit-hole. That 'egg' was never foreign, and this is the fate of the egg in any useful manner. So naturally its not 'foreign' to the observer. If you want to leave that aside I think then we can agree that we don't need to give a shit about the climate because science is not relevant to individuals. Why should we give a shit about some 'future generation' of foreign fetuses.
Protection of Environment is a deliberate attempt at stealing people's rights to choose, and is FAVORING the foreign object that we call a fetus. Why should we protect this world for THEM. Where is the equality?
Now peace out