
there’s still semen in pre ejaculate, just not as much as regular ejaculate. but of course, it only takes one swimmer to make a pregnancy. i wouldn’t take the risk personally but generally anything outside would be fine. there is the risk of something getting up there if you continue playing around
Precum itself is less likely to actually have any sperm in it, but it can pick up leftover sperm if the person has ejeculated recently. Yes there’s a chance with precum, and fingering with it, since that can lead it to the cervix. Sitting where it’s would be such a tiny chance I wouldn’t worry about that, because it’s not likely to lead up the vaginal canal into the cervix. It’s fine if it’s on the outside, it’s not going to do anything.
Cum has multiple components. Sperm of course, but also fluid to carry and protect the sperm. The vas deferens delivers the sperm to the rest of the mix (that’s the part they cut in a vasectomy!). With precum, the signal to release the sperm hasn’t happened yet, but that doesn’t mean there’s zero sperm. It can get in two ways: leftover in the system from a previous ejaculation or leakage thru the vas deferens. It only takes one sperm to cause a pregnancy.
You should never be intentionally introducing any form of cum without protection if you’re not trying to conceive. However, dry sperm is dead sperm. If your partner got precum on their hand, wiping it dry (or even washing their hands if you want) is enough to eliminate sperm. It’s possible for fluids to travel from the vulva into your vagina. Again, not something to intentionally do, but it’s incredibly unlikely to result in pregnancy.
In any case, if you’re starting to get sexually active. It’s worth thinking about birth control. It’s very easy to not think in the moment and take something too far. It’s better to be prepared. Any interest in discussing it further? Note that precum is still transmit STI/STDs. I highly encourage you to check out the article in the pic, all about pregnancy and STI risk in various types of sex.