How true we can trust the ovl kit? (im using those $0.70)

last 2 days i tested positive with OVL then immediately i did a CT scan but doctor say that im going to OVl soon, cos can still see (Egg white mucus - it strength), OVL not yet and perharp is ready soon in another few days?

today i did a OVL test again.. the line is getting lighter already.. so does it mean i missed my OVL date?

(last AF came on 3Apr) Im DAY 16 today (18April) and my expect AF date is due on (3May)...

how how.. i scare i missed it? trust OVL kit or my chinese doctor?