When to use OPKs with weird schedule??

Emma

Any of you lovely’s work overnights? I work 6pm to 6am, 7on 7off. Would it be more productive to use OPKs in the middle of the night instead of the day time?? This cycle I tested for 2 weeks with no high or peak on the strips but a flashing smiley on CB, wondering if testing at the complete wrong time of the day for me was the issue?