Hey all! I'm new to the whole OPK.  Last month was my first month and I used Wondfo--I really like them because they showed me a gradual increase each day until I detected my surge.  Obviously it didn't work because here I am testing again, but this month I decided to go with clear blue digital. I haven't hit my surge yet but I've only been testing with them for 4 days now.  My prediction from last cycle data was that I should surge tomorrow (Monday).  I'm hoping I didn't miss it on accident.  I've read some conflicting info on these and some say you may miss it if you start testing to early because it bases it on previous days tests.  Is this true? Also I can't see a progression as definite on the lines after I eject the test stick so I'm not even sure if I'm close and I don't really like that.  Anyone else feel that way or any input?thanks in advance!