Pregnancy possibility?

This is my cycle for this month and my period is expected today but haven't gotten anything and don't have any period symptoms either. I do feel super nauseous but when I took a pregnancy test it was negative. The "♥️" on the calendar are the days I've had sex. We haven't been really using any protection just the "pull out" method and he swears he didn't ejaculate in me. But I do know theres possible pre-cum that could put me at a risk to become pregnant. What would be the chances of me being pregnant?