Can Precum Survive In The Mouth And Be Transmitted Via Kissing Or Oral Sex To Cause Pregnancy?

I know this is very unlikely but still want second opinion since I m paranoid I was wondering what are the chances of pregnancy if I gave bf oral he didn t finish so just precum was left in my mouth he then kisses me but then I drink water so does he and finally 40min to an 1hr later he gives me oral could and precum survive that long and transfer mouth from mouth to vagina