This is the 2nd cycle that I've used OPKs, and I'm noticing a pattern.
CD 10, 4pm- I got a barely-even-there line
CD 11, 12pm- The left side of the test line was just about as dark as the control line, and the right side was lighter. Positive?
CD 11, 7pm- I got a lighter line, but not as light as CD 10's.
CD 12, We shall see!
Last cycle, my most positive OPK had the same thing-- the left side of the line was as dark as the control line, and the right side was lighter. It gradually got darker day by day, though... not as drastic as this cycle's.
I've read a little about women having overnight LH surges, or even short ones, where they use FMU for their OPKs and get a better reading because testing at 10am through 10pm doesn't ever show a full positive. Think maybe this is what I'm seeing? Or do you think it's the test brand? I'm using Wondfo, the internet cheapies from Amazon. So confusing, I tell ya.
Please advise, experts!

I appreciate you!