OPK help so confused ?

This is my first month using opk's the top test is Sunday when I took that I didn't notice 2 lines at all so assumed that was a negertive when I looked at it yesterday it had that really faint second line, the one in the middle is Monday when my fertile window was suppose to start, the second line was much more obvious but it was not darker then the controll line, (we baby danced anyway) the bottom one is today's (Tuesday) and it's so faint, so does that mean that's it? or have I done something wrong? So confused hope I havnt missed it this month ?