I did a clear response this morning too. I did one on weds and it was completely clear, no lines but u wasn't that surprised as I them read that they should be used the first day after af doesn't show. Well I did one anyway and there was the faintest of lines there within five mins. I also did one under water and my husband did one too! The other two had no lines at all. I read that an evap disappears if you run it under way so I ran all of them. Mine still has a really faint line, but I'm sure I can now see a faint one on My husbands! I don't really know what to think especially as mine came up with a line in the first place. The line was so faint I couldn't tell if it had a pink twinge or not. What do you think ladies?