QUESTION FOR ANYONE WHO USES OPKs

So I've been using OPKs (Clearblue Advanced digital) in hopes it would give me insight cause my cycles have been irregular. I've been doing them once a day when I wake up, so I've been using my FMU. For the past three days it's been low. This morning I wake up and I come to discover it's reading that I'm at peak fertility. Can it really go from low to peak in 24 hours? Once it's displayed, it's displayed for 48 hours so it's not like I can re-test. Should I just trust my body? My LMP was 4/29. So if my body is trying to regulate itself now, it makes sense that I got the peak fertility now. So again, should I just trust my body and go with the flow?! Thanks ladies ❤️