Need some advice/help, really worried.

Hi, my girlfriend and I were fooling around yesterday. She gave me a blowjob. I came in my hand and wiped it off. About 15 minutes later, I went down on her. I fingered her with the same hand that I came into. I had totally forgotten, but I suppose the bad combination of being horny/stressed does that to you. Anyways, when I realized what I did, we stopped, and went to CVS to get her a Plan B pill. Is it possible that she got pregnant from this?