Implantation or AF coming?

Hey ladies! So I'm 11dpo today and 3 days away from AF. I tested yesterday and got a BFN. I had cramping like AF is here but no spotting or blood but had alot of creamy yellowish odorless discharge. My cramps has been on and off and still no blood just discharges. Today I still feel some cramps and still no blood. My boobs has been sore and feel fuller on the sides. Is this a sign that AF is coming or there's a chance for a BFP?