Hello,
Thank you for your post.
The estimated risk in this case is relatively low for you. Assuming that she was HIV positive (which is unlikely statistically speaking, female from the US), the risk for you would be less than 0.1% (less than 1 in 1,000). Not knowing her status would reduce the risk dramatically. However I would still recommedn that you get tested as it was unprotected sexual intercourse and the risk is not zero.
Best wishes,
Dr José
I am from the US and so is the female. I only *** this info as I have seen many others do that as well. Thanks.