Hi,
I am going through the exact same thing you are. My AF was due on the 22nd took a HPT and Neg, I took another on the 25th and also Neg. I still have no AF and I'm peeing every 20 mins v.unusual for me. I've had pink/brown CM all day today so I thought maybe AF is about to start but it looks like it can also be a symptom of pregnancy.
I'm also too scared to take another test I really dont want to see that BFN
I've read it can take up to 14 days to implant. I'm probably just overly hopeful :(
i agree if you still dont start test again. my first few tests were neg but this was due to late ovulation. the brown pink discharge could be implantation bleeding but that normally occurs 6 days past conception so it might be too late for it.
I would say wait a couple days and if Af doesn't come first then test again. By the sounds of it you may just be getting AF but you never know. Could you have ovulated later than you thought?