4 days late

Ir

Hey all, so I’m 4 days late according to the app. I do not know when I actually ovulated bc I wasn’t consistent this month. Well I’m never late like this, only other time I was pregnant which ended in chemical soon after finding out. My boobs have been tender, nausea today has been the worst I dry heaved for the last ten minutes, more tired than usual, tummy feels hard, idk I’m convinced I’m pregnant but the tests say otherwise. What gives?