I understand your worry.
There is a risk when there is freshly open, bleeding wounds.
On your finger, the wound would have to be fairly deep, still fresh and bleeding and the woman would have to be HIV positive.
In such a case, the virus has to be able to travel from the body fluid of one person (vagina secretions) directly into the blood stream through the open wound into the body of the other person.
So far as I can find, or know of, there are no documented cases of HIV transmission from inserting fingers into someone's vagina.
Also kissing and pressing tongue is a very uncommon method of transmission of virus though theoretically the possibility exists if your partner is HIV positive and had even a little blood in the mouth.
Saliva is an extremely poor carrier of HIV, hence kissing, sucking, and licking the lips, mouth, and tongue are basically safe.
There have been reports of HIV being transmitted during a deep "French" kiss, and in all such reported cases exchange of infected blood was involved.
Therefore the risk is very very small, hence testing is recommended just as a routine and for peace of mind.
Hence if you are worried about getting HIV from this incident which is of a very low risk, I would recommend getting tested by the HIV antibody test immediately, and then at 6 weeks, 3 months, and a final confirmatory test at 6 months.
I hope this helps.
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