pull out method might have failed!!!!!!

Okay ladies I'm on my fertile week this week and I'm not on birth control we just used the pull out method and it has worked out of us really good! We have two little boys and my husband and I are not entirely sure if we want to add another one to the bunch just jet or if at all!! My question is we had sex this morning and he didn't fully came in me, I'm sorry for the TMI but he did came a very very small amount in the entrance of my vagina!! Is it possible for me to get pregnant again from that???