My first BP was sold to me as male. She was probed and is DEFINITELY a female.

I kept her name - Prince Oberyn.
When I bought her a mate, I named him Princess Pandemonium.

They don't care what you call them. They don't get complexes.

And on top of that, you may just want to wait a week or two and try again. You may be able to find a locally owned petstore with someone who is comfortable probing snakes, or they might know who can do it. I know my reptile vet does it if you come in for a normal checkup or whatnot.