Well, your risk from the kissing for contracting HIV would be zero Harry
If there were no actual blood on her hands and you didn't kiss her cuts then, again, the risk would be zero.
So I'd say overall your total risk was zero.
If by chance there was fresh blood on her hands and it came in contact with the grazes on your hands there would be a very very small risk
The virus is very fragile outside the body and only in fresh blood
The test would be accurate but if you take it early than three months after contact, if it is negative that can be a false negative--it takes about three months to seroconvert to positive