not sure if I understood your question but I'll tell you what I've been doing if that helps at all. I follow the date guides on the opk test pack and start seeing on the sticks from the day it suggests and I do mine first thing in the morning,that way I havnt got to worry about have I drunk too much before etc and then I keep my sticks just incase until I get the darkest line.thatway I can compare them. I know if its a positive cos the test line is always as dark as the control line or darker. If I test again there's either no line or a very faint one so I know the previous day was a winner.most months thats worked for me.I don't monitor ovulation any other way,wouldn't have a clue how to do it.hope that helps. I use clear blue opk tests but they are pricey,prob why I have no money!