BFN???

Ragan
Cycle day 37 and I am two days late. I took a test tonight and I got a BFN. I have had lower back pain, boobies are so sore, areolas are bigger, I had fluttering in my abdominal last night, and gassy too, moody today. No signs of AF .. could I still possibly b pregnant even though I haven't got my BFP?