Just recently diagnosed

Hi, I wondered if anyone had any info to help? I'm panicking and googling everything. I had a breast biopsy on wed and get results on Thursday next week. At the time their didn't seem anything a miss under my armpits, I had ultrasound which just showed a mass in my left breast. Is this positive? Or is this just being said to stop me worrying more? Also I feel a sort of flutter in my chest, is this a sign that things have spread? Thanks for any info or replies x