Precum myths/truths

So I've been doing some perusing on here and have seen a few posts saying you can't get pregnant from precum, but if your guy ejaculated (and doesn't clear his pipe, if you will) and you get back to sex fairly quick it's possible to still get pregnant because there's active sperm that travel in his next precum.

What are your thoughts, opinions or experiences?

**EDIT: I'm not uneducated. I'm simply just wondering what everyone else thought or has experienced. I'm not necessarily ttc but I'm not trying to avoid it either. If it happens it happens. I'm 26, not some little middle schooler afraid to ask mommy. Thanks.