Are these two sentences correct:
a) "It's not up to us to judge when a woman becomes pregnant, whether she's married or single."
b) "It's not for us to judge when a woman becomes pregnant, whether she's married or single."
Both bold parts are correct, but to my eye the sentence as a whole reads unsatisfactorily. I think you are talking about when it is right or proper or appropriate for a woman to become pregnant? The "right or proper or appropriate" aspect is not clear enough in your sentence.
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Both bold parts are correct, but to my eye the sentence as a whole reads unsatisfactorily. I think you are talking about when it is right or proper or appropriate for a woman to become pregnant? The "right or proper or appropriate" aspect is not clear enough in your sentence. Also, the second part of the sentence, after the comma, does not flow perfectly from the first part.