Hi, I assume you are pregnant, and this is why you are asking? Does the pregnancy conception date count back to the eventful week you are describing?
It would be difficult to get pregnant from being fingered even if the guy had semen on his fingers. You say he did not have semen on his fingers. This reduces the chances to 0%. I guess you only have to worry if you think he secretly did have semen on his fingers when he fingered you. If you think that, you should do a DNA test.