I need some expert advice/

I’m toast period ended on the 16th of November, and I had sex on the 17th and 18th of November. Both days he came in me.

I want to know, would i possibly be pregnant? My period starts in 8 days according to Glow, and im just worried/ yet excited/ to miss my period and turn out to be pregnant.

What are the chances of me being pregnant? Ps, I took a pregnancy test yesterday evening but it came out negative.

How early can conception occur and how long after implantation would a pregnancy test come out positive?

Thank you for your help.