Period late, stress or pregnancy??? Help please?

So I had sex with my boyfriend on my last fertile day. ( 8%) He put it in without a condom for 10 seconds and that was all. He didn’t ejaculate in me. He didn’t masturbate before so I’m assuming most of the precum is dead. ( Idk lol I’m not a expert)

I’ve been worried about it for two weeks now and now my period is two days late. I took a pregnancy test the first day I missed my period and it was negative. I’m not having any pregnancy symptoms either. Now I’m panicked and need help. Please and thank you.