13dpo bfn

I'm 13dpo, AF is due tomorrow, I've had a negative tests the last 3 days I've tested (I cant stop POAS)

I've felt nauseous & had headaches and a little bit gassy and that's as far as it goes

I've started cramping today which I'm assuming can only mean AF is on her way the lil witch!

Has anybody experienced similar and had a BFP? Or am I more than likely out for the count this month?