and got very strange results with a 1st response test. Right away I got two distinct lines, except one line was red (the control line) and the other line was grey???

It wasn't a little streak of grey, it was a thick grey line right were a line should be. I wish I had gotten a pic of it.
I was a little taken aback, because I shouldn't have been testing anyway, I am only 8DPO.
I then saw that the results window had some wetness on it, so I got some toilet paper to wipe it away, and the grey line wiped away too!!!????? The test then read a def BFN!! I had my hopes up for a couple of seconds. What dirty little tricks these test play!!!!!!!!