Help Please!!!!!😰

Today is the fourth day of my period. 
My boyfriend and I had anal sex, there was actually enough lube and it didn't hurt as bad as the first time we did it. 
Anyway, while we were doing this I had a tampon in. 
He didn't think he was about to ejaculate but he actually did, it was on my butt crack and kind of dripping down towards my vulva, I quickly put my hand over my vagina to block anything even though I had a tampon in. I quickly cleaned up and then changed my tampon. 
I am a week away from starting my fertile window and my actual ovulation day is about 9, 10, maybe 11 days away. Am I okay??Â