Hi. My Boyfriend And I Are Both Virgins, And A

Hi. My boyfriend and I are both virgins, and a few weeks ago we engaged in oral sex. We were both completely naked, but my vagina was no where near his penis when he ejaculated. However, I have a fear that some semen got on my foot and it came into contact with my vagina, but I'm not absolutely certain. Could I be pregnant because of this? I don't have any symptoms, and my period was on time, but it was much lighter than usual. I had also been off of my birth control for about a week when this happened, but started a new pack the very next day.