OPKs vs ultrasound when cycles won't behave

i’ve been doing both LH strips and follicle monitoring bc my cycles run 32-51 days. the OPKs seemed great until they didn’t, got a surge on day 18 last cycle but ultrasound showed my follicle wasn’t ready. day 22 another surge, which happens with anovulatory cycles apparently.

androgens mess with LH readings. follicle monitoring’s more reliable but expensive and requires multiple appointments. OPKs are cheap but kind of pointless if you’re not ovulating consistently.

we did the IUI based on ultrasound timing, not the strips, and that felt more real. anyone else tracking both? worth the OPK cost or just stick with appointments?