This is my first month using OPKs. I bought a 50 pk. of the test strips off of amazon. I have been using them since the first day after my period because my cycle is irregular. I am currently on CD17 and when I took a test this evening the test line still wasn't as dark as the control line. I also had bought the Clearblue Digital tests and decided to take one. I got a :) meaning I'm at my peak. Anybody else have faint lines (negative) test strips, but then a positive on a digital?  Posting pics of both tests below. Thanks in advance!