Isn’t there a Mishnah in Berachos that lists examples of tefilos shav? If I’m not mistaken, one of the examples is davening for a specific gender of a child when a woman is pregnant. The implication is, is that once a woman is pregnant, even though no one knows the gender of the baby, it’s still a tefilos shav to daven for a gender that has already been determined, and it would be a neis to change it. By extension, I would say that seeing a doctor does not change the teva. If a physical reality exists, it exists, whether you know about it or not, and it would be a neis to change it, whether it is recognized or not.
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