How easy is it to make a woman pregnant if there's no penetration?

As usual, Googling is pretty useless here as there's a lot of fear mongering. I want to know practical experience of the sexually experienced men here.

I would wrap up only during penetration. But, during foreplay, of course precum touches a woman around her belly, thighs or pussy. Or something like a tit-fuck would have cum dripping down while she wipes it away.

So, what are the chances of a pregnancy happening here, assuming the woman isn't sinister enough to put it in her with her fingers.