I'm new here..simple question..could I be pregnant?

Hi, this is my first day with this app. I am 16 years old with severe anxiety. Like my boyfriend can just touch me and I can get scared of pregnancy. Anyway, i was wondering if you can get pregnant on your period? I got my period on the 7th and on the 9th my boyfriend and I got together. I have a 27-30 day cycle and this last period actually came a day early, making it a 27 day cycle which wasn't that odd. Anyways on the 9th, while I was on my period. My boyfriend and I had anal sex and other sorts of foreplay. He would rub his tip on my clit and anal was the main thing. He never ejaculated near my vagina/vulva/ or anus. But...I'm still nervous about possible precum or something. So let's say precum did come in contact with my vagina..I had a tampon in by the way. But let's say it somehow swam up. I don't start my fertile window until the 15-16th...and then I ovulate somewhere around the 19th..could I get pregnant from this?