Is Pregnancy Possible Through Non Penetrative Sex?

Hi I had my gf give me a blow job and then I fingered her. When I ejaculated I covered my penis with a towel, but when I put my penis back into my pants I might ve touched left over sperm on it. After a minute, I fingered her. when I did this yesterday she said she is probably in her ovulation days. 1. What are the chances of my gf to become pregnant? 2. How and when would I know for sure that my gf is not pregnant? 3. What can I do when I can t find any emergency contraception in any store?