Weird, I am sure I see something on your link. In fact I'm squinting and doing everything like i did with my own internet cheapie, and I couldnt even get it to show on a camera. It was in fact, a bfp, though.
I say hold out and stop the cheapies, they are pish, in a manner of speaking! I bought a normal clearblue after 2-3 days, and that had a line, faint but obvious. Avoid the digis too though, they wont pick much up just now.
Going to try and find the old pics of my bfp, and see....