ovulation kit

Clear blue advance ovulation kit- does anyone know exactly how it works??? So I had tested this month and I never got the "high" I only got the normal smiley face.... I don't know whether that is good or bad???! Can we still conceive or not?? Does this mean I am having problems? I just had a laproscopy done in sept for endometrosis!! We have had two m/c this past year so going on a year of TTC!!!! Getting impatient now..... I am new to this app so I don't really no what to expect. Thanks!!!!!