Pregnant or not...

I’m 17.

Last June 5, my bf ejaculated on my belly while I was lying down. (We never did penetrated sex. Just oral) We cleaned up the mess with alcohol and I rubbed my belly, my and his hands and other areas that the semen came contact with it. Then he fingered me.

I recently had my period but I was 2 days late. We started to get worried and when it came, I was so relieved. My bf however is still not convinced that I’m not pregnant.

I searched online about spotting because I heard it is commonly mistaken as period blood. So when I read that spotting cannot fill up a pad or tampon over a few days, I told him that my pad from earlier before I changed was very full with blood that looked like my normal period blood.

He’s still not convinced tho. Any comments or advice? Am I pregnant?