BFP then BFN ... Need HELP

hello ladies,

i need ur guys advise. As u see the picture, I got BFP at 14/15 DPO and symtoms: sore breast (white bumps around my breast), back pain, light adbominal cramp. I thought i was preg. then i tested cheap HPT on 11/12 and they turned out with second faint lines. Then i decided to buy clearblue digital and tested again and i got BFP. after three days (AF was due yesterday according to glow & ovia), i got BFN. but no sign of AF coming. As per glow & ovia, i m 4w 2days today. I have a PcP appointment today at 2:30pm but cannot wait for the answers :( don’t know what’s wrong with my hormones or body :( appreciate on any comment, ladies ...