Could this be early signs - advice?

Not sure if these are early signs of pregnancy or period any advice would helpful. For the last week been having dizziness (mainly when I stand up) nausea every day mainly when I eat and vomiting, slight stomach cramps, my boobs are really sore and seem bigger, I ate a meal the other day tasted of fish which I wasn't eatting. My AF is due today, no sign of my period yet, took a test which didn't work as no line in the control window. Anyone else had these signs before?