SMEP advice

Amanda
Anyone have success with the SMEP?  We are trying it this month, but had to start on CD 9, instead of 8.  Do you think that will throw us off?  
Also, my opks are having a hard time cuz I'm on a weight loss plan where I need to drink tons of water.  My line never gets strong cuz my urine is diluted.  Anyone discover a way to get around that??