Aih, OPK yang half-line half-line memang frustrating kan! Honestly, banyak mums macam ni jugak, bisa jadi LH surge mu memang subtle atau pattern mu irregular, so senang nak terlepas the actual peak. Kalau consistently half-strength macam tu, maybe checkup dengan doctor or fertility specialist to clarify, sebab ada orang LH surge nya cepat sangat or hormone levels dia memang lower, bukan berarti tak boleh conceive, cuma need to time it differently maybe. Dalam masa tu, you still CAN conceive lah, just harder to pinpoint exactly when, so boleh lah try jaga timing dengan cervical mucus instead or yang lain, but honestly tanya doctor would be better, they can see the full picture.