CD 37...20DPO.....BFN!!

I don't get it....my boobs r killing me, I feel sick, and my period is extremely late. Yet I got another bfn....what gives? Either let af show her face or give me a BFP! Simple as that! My period is only late by a day or 2....not a whole wk! Some1 any1 I'll take any advice ur able to hand out!!