I'm using internet cheapie OPK strips. You know, 50 for £7 in individual foil pouches. Test line needs to be darker than control line for a +ve. I'm CD 13, but counting day 1 as the day of my ERPC following mmc. Each day the test line is getting a bit darker. Does this mean that my LH levels are climbing? Obviously they are not actually +ve (i.e. they have not detected a surge of LH). I'm getting a lot of the aches I usually get running up to ovulation, but have not really used these strips before. Obviously this is probably going to be a post mc WTF cycle, but thought there was no harm keeping track...I did a pg test on day 5 which came back -ve.