Ongfamy, everyone has different time of ovulation. are you using the Clear Blue ovulation test kit (7 tests in a pack)?
If you are not doing BBT, then you should start testing from Day 9 till you get the smiley face.
I have friend who can have super long cycle, need to use 3 packs for each cycle.
I used this before, and i ever got smiley face on Day 14-16, then another cycle Day 20-21.
Then i upgraded to those Clear Blue Ovulation test kit that count from the Day 1 of your cycle.
Same thing each cycle i have different days for the ovulation. until last few times i can have those half result, if not peak means no ovulation. just that hcg is pretty high, but not until actually ovulation loh. It can stay like that for 1 weeks, if that happened i have very long cycle like up to 50 days kind.
Once i decided to do IUI, i stop using this already. Very pek chek, anyway IUI surely i will ovulate. so to reduce my stress level, i stop measuring this.