compare to your other ones. My test line never really got darker than the control line but at the darkest, I knew it was a surge and then using them to chart the surge leaving told me plenty.
From this test, I'd BD these next three nights and cross my fingers. If I couldn't the night of surge, no sweat but definitely tomorrow nigh and the next night or morning
of afternoon.
when ever!!
good luck, fingers crossed for ya!
jm