is there any possibility that I might get pregnant?!

hey..I just need ur help dedly cause am so worried:s me and my bf were kissing on bed and yeah things grew a bit then he we were above each other kissing and he was touching my breast but I was still wearing my jeans. Underwear and a pad cause my period had just ended thw day before.. He ejacuated on my boobs and my neck yes it didn't reach the area below or my stomach.. The thing am worried about is: 1st: while being above each other his penis was on the area below after he took it ot from his boxers but I was still wering my jeans so am afraid if sperms could reach my vagina by any way! And 2nd: I heared that precum could contain sperms so am afraid if any of those fluids was on my stmomach and leaked down to my vagina and I could be pregnant! i don't knt if precumming is a fluid running like cumming or it's just few drops so yes am worried alot! Am a virgin..18 years old and thas was my first sexual experience ..my period started on 6/4 and ended on 1o/4 and we had sex on 11/4 ..sryy 4 this long speach but please help me if u knw.thx