Can Pregnancy Occur If Pre-cum Was In My Mouth, We Kissed, And Then He Performed Oral On Me?

This is what happenned, me and my bf had intimate moment during my ovulation day. I gave him a head and I am sure that I got pre-cum on my mouty from his penis. After that, we kissed, then he ate my clitoris. My question now is Can I get pregnant in that way? Did we transfer his pre cum from my mouth to his mouth? Please help me, I am really worried.