I'm worried about precum

So yesterday, February 24, I had sex with my girlfriend for the first time. We were both virgins at that time and such.

Anyway, we had sex and I'll be honest. It wasn't full sex.

I was only in there for a about 30 seconds at most, I really was only in there to pop the high-man. Well, tonight my brother told me about precum. And that honestly scares me, I'm 16. My sister is pregnant and we're a Christian family. I just don't agree with the sex thing. Anyway, I can't be a father :(I know I am probably going to get stuff like "don't have sex" and all that, but I wanted to and it's not going to happen again any time soon.

Back to my question. I'll admit, she was grabbing it in such once I got the boner and then she sucked it, and then I was in for about 30 seconds at most. And it wasn't even enough to make me cum. I had masturbated the night before, to be honest. And I had super bad blue balls later that night.Anyway, should I be worried about precum?I'm actually really scared and her periods not for another 2 weeks at most and I can't wait that long.

And no worries, I'm using condoms next time.

Thank you for your helpful responses.