Then why don’t they ask this question for all men? Why don’t they ask every man that walks in if they’re pregnant? If the justification is, “we must ask because the risk is always there, no matter how small,” then why would you dismiss the risk that the man that walks in is actually a trans man that happens to be pregnant?

If this was only about trying to cover all of your bases, everyone would be asked if they are pregnant, regardless of gender.