I know this is getting repetative but I need help! I've posted this in all TTC boards! Can you help?

HELP

I know, I should just buy the darn digital but I don't have the $ b/c of having to take OPKs every day from CD 10-11. Could today's PM test be a + & CD 15 not be a + ?
Feedback is much appreciated!!! Oh, for those looking at this for the 1st time, last cycle's OPKs never showed a test line darker than the control but you could see the surge!