I got my ovulation test strips online and it said (for mine at least, this is my first time using one) that if the test line is as dark as, or darker than the control line, then you are ovulating. But if the test line is absent or lighter than the control line, then it's a negative result- not ovulating. I recommend reading the instructions carefully because i misread my results lol
if you are on clomid you can have a few days of positive tests..