I am so confused. Chemical pregnancy??

I have no idea what to think. I'm 15dpo today. I have tested everyday and my results have been positive. I had my clear blue digital show 'pregnant 1-2 weeks' 2 days ago. Today, it said 'not pregnant'... But my IC's are still positive? My temp is still up, I'm not bleeding, I feel so sick but I have no idea what to think now. Please someone help me, I feel like I'm losing my mind :-(