According to most of the HIV forums and HIV experts, fingering has no risk even if there is a small cut on your finger. If you have a cut which is severe enough, big enough, bloody enough for HIV virus to be transmitted, you wouldn't have used that finger to finger someone. The girl wouldn't allow you to do so either.
No need to test, no risk even if it was bleeding.
what if the cut was bleeding? should i get tested? and how long after