I'm no biologist but...

But how will the affect be disproportionate? In the LGBTQ+ community, accidental pregnancies will be lower, by virtue of fewer of the couples in that community engaging in sex that can biologically result in pregnancy.
The only reason abortion bans would disproportionately affect is that people of color disproportionately experience poverty (with poverty being the actual factor at play).

And how does that compare to the U.S. as a whole?
Also what percentage of the LGBTQ are in relationships that will result in unwanted pregnancy? Lesbians and gays, certainly not. Bisexuals, sure. Trans should be at a lower rate since it's less likely that the bio genders will be a match for reproduction. This MUCH lower fertility rate in the LGBTQ community should more than counteract the slightly higher rates of poverty in terms the how proportionately they are affected.
Not to mention the LGBTQ community usually has better safe sex education and resources in the form of LGBTQ community centers.

Less than 1000, across the whole country is disproportionate, disproportionately low. Meanwhile, sperm donors? Who gets intentionally pregnant and then has an abortion (with the exception of medical issues).