I’m so confused..

so, i’ve heard it is only ever possible to get pregnant if a guy physically cums in your vagina. but i’ve also heard that if a guy gets some sperm of your vulva that it could swim up in there?? i’m so confused. we had sex with a condom but when he pulled out i swear i felt something drip on me, but the condom for sure didn’t break. it was only the second time i’ve had sex and he thinks that it was just from me being so wet? can anyone help me here?