is it possible to get pregnant this way?

I gave my boyfriend a handjob and blowjob, and I swallowed, so all that could've been on my hands is Precum and spit. He had not ejaculated earlier that day so there could not have been much sperm if any.
I wiped my hand off on a towel, then went to the bathroom right after and touched myself during my fertile window. 
I'm scared about pregnancy from that.
Is that possible? PleasE no negative comments I'm a hypochondriac. Would it be possible even if I fingered myself? My boyfriend says it's not and pregnancy isn't that easy to happen