Can I be pregnant and not know yet ?

Carlean

So I’m currently 3 days late on my period and I’m never late. I work in a medical office an took a pregnancy test today it came out negative ? Do I have to wait a little to take it or did I take it to early ? Like I said I’m never late on my period ever! Any suggestions ? If you have any suggestion please let me know . I’m not stress at all or having any disease . I get my period every time and now I haven’t gotten it for 3 days. Should I wait a week to take another pregnancy test. I’m very nauseous today and yesterday. I have the urge to pee since Friday