Tested Negative, Late Period

Hi all, what do you think is going on? I tested negative 3 days ago, which was 1 day before my period should’ve started. It’s 2 days late and I’m super nauseous and feeling yucky. My period is incredibly consistent.

Can you share your experiences with testing negative with no period? I know I have to be patient. I’m anxious but hopeful... and wondering if anyone else has experienced this?