Oh you sound similar to me - except for the bf bit which I am not. I had bfp but it came up so faintly and after 10 minutes - but I couldn't get it out of my mind so I just bought more tests and did them obsessively every day (bit exxy but then I rationalised that it's a pretty important thing to know)

I ended up getting a stronger and stronger line each time. I am now 15 weeks and worked out that I must have been 2 or 3 weeks when those lines were coming up faint.

I would suggest waiting a week to re-test. (Not that I could contain myself that long but maybe you can??)

Hope you get the result you want.

Kate