Aah, period irregular memang tricky kan! A few of us dalam group ada jugak varying cycle macam tu, some months 21 hari, some months lagi lama, so timing ovulation jadi confusing gila. Honestly yang paling reliable, kena track basal body temperature or guna ovulation test strips (the ones dari pharmacy, super helpful), because kira-kira je dari day 14-16 tak selalu accurate kalau cycle pendek-panjang campur-campur macam yours. Satu mum friend I know, dia guna app Flo combined dengan OPK strips, baru dia dapat pregnant sebab she figured out her pattern lebih precise. Maybe worth trying? Good luck, semoga cepat dapat!