Tips on using ovulation strips for conception?

Any tips on using ovulation strips? They just arrived from amazon today and I’m really excited.

For some background, I haven’t been officially diagnosed with PCOS, although my dr says it’s probable. I’ve been on Keto diet since Jan 7 and I’ve lost 20lbs. Periods have gone from 8 weeks apart to 4-5 weeks apart since I started my diet. But they are still irregular. I’ve tried pinpointing my ovulation using the app and signs of ovulation. But no luck yet. So I bought ovulation strips to help.