what did I swallow?

Okay sooo me and my boyfriend were about to start having sex... we were making out before hand and dry fucking with clothes on. So once that was done I proceeded to you know pull his dick out of his underwear.. and as soon as i put my mouth on the tip of it, i tasted something wet..? What was it? Do guys get wet like us? Is that was precum is? So I just quickly swallowed it and sucked awaaay😩😅😂