Pregum pregnancy with not involving in intercourse

Yes, pre-cum can cause a pregnancy.

So my advice is to make sure that any pre-cum or semen get near the vagina and that your hands and fingers are washed before fingering or another cause for semen to get near vagina.

I know you posted some time ago and I assume you and your girlfriend have answered the question by now. But it is VERY unlikely that you could get her pregnant through precum foreplay. Nature makes it easy, but not THAT easy. It is true that precum CAN include some sperm, especially if you are approaching orgasm, or a second ejaculation and you haven't urinated between them to "clear the system" so to speak. But rubbing your genitals together, even bathing her clitoris in your precum is highly unlikely to get her pregnant. In fact, even if you actually ejaculated all over her vulva and clitoris, the chances are greater, but still low. There are all kinds of hazards and roadblocks for the sperm to reach their target (which is why you ejaculate so many of them each time you cum), so the miniscule number that might possibly be in your precum would literally have an "uphill" battle to get deep enough inside her to make her pregnant. Sperm have to be pushed into her vagina to reach her cervix, and the deeper the better. The interior environment of her vagina is designed to actually make it hard for sperm to survive very long. This is kind of an elegant method of ensuring that only the strongest, healthiest, and most vigorous sperm get to the target. HOWEVER, if she is all wet with precum from you (and herself), then do be careful about eating her out or slipping fingers into her vagina, as you COULD push any sperm present in your precum into her.

As for oral sex ... passing actual CUM back and forth (or licking it off her body) could be a problem if you then go down on her. If she merely had your precum in her mouth from sucking you, and passed it to you through kissing and so on, tongues don't really have that much of a reach, so the chances are pretty low that you could get her pregnant by licking her after that. Possible, yes, but very low.

In short, consider your penis like a LOADED GUN, and take reasonable precautions when using it around her