It was with no condom?
If you used condom you must know that there´s nothing to worry about. But if you did not, don't do it again.
Anyway, probably the 12th week result test will be negative.
Best wishes
anal sex with a transsexual
It's a good indication but it's not conclusive. It's not the standard test for diagnosis. Test again at the 12 weeks (antibody test). Probably it won't change.
What was your risk?