17 days late !! Wtf

So i never been this late one time it was 13 days but it came. I haven’t had any cramps i been light headed 😕 had nausea and fatigue i had sex 1 night but it was like a 1,2 thing we didn’t finish all the way. I did test the week after my period was due it was negative 🤔 I’m not on birth control