My boyfriend and i were making, i was wearing boxers and he was wearing boxers + sweatpants. his pants were wet because some water had been spilt on them but im still worried that precum might have gotten through. there are no white stains anywhere?

In the scenario you described, pregnancy is not in the cards. It appears that you and your partner are moving in the direction of actual intercourse. It would be wise to learn about appropriate contraception. Here is some information regarding how one becomes pregnant: https://www.plannedparenthood.org/learn/pregnancy

If worried about pregnancy, that is not possible in above circumstances, fabric acts as mechanical protection. Contraception remains otherwise key in avoiding undesired pregnancy and associated anxiety and when intercourse is likely to occur.