Preseed question.

Hello all of you pretty ladies. I have a question. My fiance and I got the Preseed lube last night and tried it. My ovulation is today, according to the <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> and another app. I was wondering how successful this is in your opinion. We have been trying for a year now. And no success. It's getting discouraging when I see a BFN on tests. And when do you think is the best time to test after ovulation? Lately I have been feeling really infertile, especially with my health. Any words of encouragement? Thank you in advance!