Late today

Alleah

Hello, my last cycle was 28 days. My cycles are normally 30. Do I say today that I am 4 days late or 6 days late? I’m confused and am unsure. I keep saying my period will come but it hasn’t and I’m never late. Im going to test today because my sister is up my ass about it. I know life is a beautiful thing but I’m 20 and I’m in school studying to be a nurse and I don’t feel financially ready to become a mom. I’m in denial right now and I just want to wait until tomorrow. Should I test? Should I wait?