How would this result?
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If a fetus can be identified in utero as being gay then some women will abort rather than have a gay child, especially those upper-middle class college educated white women who don't plan on more than one or two kids.
Gay activists will argue vehemently that this will eventually lead to eradication of the next generation of gays. They will demand that gay embryos be protected, in other words that they have the right to live. Pro-life Americans will join them arguing that all embryos have the same right. The feminists and libs will fight just as hard against it. The fight between the gays and the feminazis will tear the democrats apart and weaken them as a party to the extent that they will become ineffective and will not have the muscle to stop the reversal of Roe v. Wade.