Just wondering if anyone knows if the day your LH level surges can change from month to month? I'm on CD 13, and last cycle I didn't get a positive OPK till CD 16. I bought the "confirm" brand OPK test kit and did one, and it's nearly positive! I'm certain that tomorrow it'll be exactly the same strength line.
Has anyone had any experience with that brand? It's the first time I've used them too.
I'd post a pic but not sure if I can off my phone.