Hi there!
You always have some amount of LH in your blood, as you know it is the surge you are trying to catch. When I was using my ovulation strips this month (I was using the Clearblue digital ones - expensive, but really clear on instructions etc), I started using them on day 13 of my cycle. They recommeded that I start on day 14, but as it was my first month charting, I thought I'd better start a bit earlier. Even though you are waiting for the digital machine to give you a result of a) an circle (no surge) or b) a smiley face (surge detected), when you take the strip out of the machine you can see the lines as with other ovulation strips.
My results were:
day 13 - no surge (no line)
day 14 - no surge (a slightly faint line)
day 15 - surge detected (a definite line, but fainter than test line)
day 16 - surge detected (a strong line)
day 17 - no surge (but a faint line)
day 18 - no surge (but a faint line)
So, from my own experience this month, it does look like the results get stronger until a definite surge (the darkening line seems to indicate that a surge might be on its way). So get bding!!!!
Others in on the site have used other OPKs and have said that if they don't get a definite dark line, they take their darkest line as a sign of their ov surge.
I hope this is of some help!
Good luck getting BFP!
lol
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