Hello Alex,
Thank you very much for your post.
Provided the condom remained in place and intact during the penetration, it is highly unlikely that you had contracted anything, and certainly no risk of HIV or any other blood-borne virus, as she had not ejaculated, and even if there was precum, that would probably not be enough to put you at any risk. If that had been the case, there might have been a possible risk of anal Chlamydia or Gonorrhoea, but I would still estimate this to be very low.
Best wishes,
Dr José
i just posted a question but did not see it post