How to use LH tests?

Janna

We’ve been trying for 16 months, and have got pregnant twice - the very first time, and then the 10th month - but both ended in miscarriage.

I’m starting LH testing to ensure we’re timing it right. The instructions say to test once in the afternoon starting on Day 12. I feel like day 12 is too late though, and I’ve seen Glow girls test multiple times a day.

So what’s the best procedure here?