My BFP's started out like really decent evaps....im now 11dpo and have only just started getting really obvious bfps...still not as dark as the control line. However, testing wasnt the deciding factor, i had very very sore BB's from about 2dpo...then each symptom become more exaggerated as each day passed. i knew i was pg before i even considered doing the FRER. AF isnt due untill saturday, but im already being sick every time i eat and cant even touch my BB's.
My point is, HPT's arent very accurate early on. And it also depends on when you O'd in your cycle, the later it was the longer it takes to get a BFP.
Id say, tune into your body!! Most women just 'know' and get a funny 'feeling' in their tummies when they have finally conceived, at least this seems to be the case when you are very much in tune with your cycle and body and are actively TTC.
You have every chance of still getting a BFP this cycle! Id keep testing every two days till AF arrives, and good luck!!
~sarah~