Kant's contradiction of the will seems to suggest that it is inconsistent for us

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Kant's contradiction of the will seems to suggest that it is inconsistent for us to allow abortion; that it is inconsistent to simultaneously will that we live and that allow that our mother could have had an abortion (meaning we wouldn't live...) However, I find this a little unconvincing but can't quite get it down. Is it not consistent to argue that the rights of me as a foetus are overridden by my mother's rights as an adult and that I will everybody to be treated according to the rights the can claim despite the consequences? Thanks a lot in advance!