4 days late

M

I was supposed to start on the 27th but i still havent. I took a test a couple days ago and it was negative. Today im super nauseous and dont feel like myself. Is it possible to still have a negative test at 2 days late? Could i have ovulated late? Should i take another test or wait and see what happens? I included a picture of my test from the other day, the line was directly in the middle of the test for some reason.