You've asked a lot of questions about precum. I hope you can get into a good sex education course to fully understand how things work. You've really been answered. "Precum" does contain sperm as you've been told. But generally a penis has to enter the vagina in order for pregnancy to occur. Any time a penis is going to enter the vagina as in intercourse, there needs to be a condom involved (or someone needs to be on the pill) as otherwise you are risking pregnancy. But at this point, you should consider your question regarding this fully answered.