Helppppp😩😩

I'm so scared😪
On the third day of my period my boyfriend and I had anal. NO vaginal sex. When he came he wasn't near me, but I'm afraid of precum dropping down possibly. I have a tampon in and my undies stayed on (he just pulled them over but they stayed over my vagina). Should I be scared? I was 12 days away from my ovulation day and had a week long period.Â