The suspense must be driving you crazy I hope it's positive. How long do they say the injections take to secrete? How faint are the lines? Does the 2nd line Come up fairly quickly?
I'm pretty sure the clear blue digitalis don't pick up a BFP until hcg is over 25. What other tests have you been using? I find the FReR are OK for comparing lines but internet cheapie are terrible. In saying this I had a fairly faint Fr with one of my babies and was convinced it was over as my test before it was very dark. Hcg showed my hcg was 3000 which gave me the faint line but my hcg with the dark was was 1050.