Precum fingering

So i touched my penis through my underwear and that time I touched my precum and after 20 min i fingered my gf but i knew that in those 20 min we took a break and my finger was completely dried. By touching too much of her clothes ,rubbing her back hugging, clicking some pictures and i used my phone also in that 20 minutes. I can tell you that there is no sticky or wet substance in my finger when I start to finger her.

so can she become pregnant by this?or am i thinking too much.. please help

More info: Its precum not sperm and the amount of precum was little not so much.