Negative at 12dpo.. Still possible?

Today I'm 12dpo and since I've had many symptoms in the past week, I thought I would test early. It wasn't my first pee but my second... BFN. Is it still possible I could be pregnant? AF is expected on Thursday.  We BD every other day during all of my fertile days. 
​My symptoms have been odd... Crampy, extremely tired,  sore boobs, and have been craving turkey sandwiches and hot dogs - two things I normally would not touch! I had three crying spells and have had lack of motivation at work because I'm so sleepy.
​Hoping for a BFP, but now losing hope. Today I'm having some dull lower back pain 

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