When i was ttc i peed on so many sticks it wasn't funny.

With DS I think I was a few days late and got a BFP but 3 days later got a BFN in the dr office. Bloods were done and numbers were fine but apparently the amount of water you drink can make a big difference to how sensitive these test are which is why you should try and use FMU

With my DD I tested heaps! You can see on my chart (at the top of my sig) the pg tests and their results but they were very faint and never got any darker even at 6wks.

I believe the important ting to remember is that the hormones don't start doubling until implantation which can be between day 5-10 so try and hold off as long as you can