IB? or start of AF ?

my period was supposed to come on the 20th but still hasnt showed. Some days i feel like i have symptoms.. some days i just dont know and i feel like af is around the corner. Ive had cramping since the end of ovulation, i experienced some abnormal dizziness last week, but its kinda cleared up only light headed here and there, my nipples were supor sore and they barely feel sore today. im 13dpo today and got a bfn yesterday. i noticed that i can taste the metal from the spoon too lol. and well today i notcied that i had a drop of orange/rusty color blood in my underwear along with some creamy cm... i thoght it was af but it stopped.