Hi. me and my boyfriend did not have sex . we both were wearing underwear. but then he dropped his underwear and dropped little precum on my underwear . is there any chance to be pregnant? we did not touch naked it was only little drops?

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

Pregnancy 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.

Precum has no sperms and sperms have to enter inside the vagina to cause pregnancy. So none in this scenario