Welcome to the forum.
As it happens, the question immediately before yours on the forum -- which I finished answering just a minute a go -- is very simpliar to yours. Although the details of your event are different, the explanation of why your risk is extremely low is the same. Please take a look, including the follow-up comment in addtion to my initial reply:
http://www.medhelp.org/posts/HIV---Prevention/Is-this-an-HIV-exposure-risk/show/1815147
In your particular circumstance, I really don't accept a high likelihood your fingering partner had HIV. If she was, there could be a slight risk you were infected if your entire nailbed is red and raw, and was continuing to bleed. However, it doesn't sound like that's the case; and in any case, within a few minutes blood clotting creates a firm barrier that markedly reduces the possibility of HIV penetration to susceptible cells. And as I said in the other thread, nobody else has ever been known to acquire HIV by fingering, regardless of cuts or nicks on the fingers.
So you can consider this a no risk event, with no need for testing. Of course you're always free to be tested anyway, if my advice doesn't resolve your anxieties and you would gain further reassurance from a negative HIV test result.
Regards-- HHH, MD