Getting worried im not fertile...

Been trying for solid 6 months, and this last month I bought ClearBlue Ovulation sticks. Been testing when the glow app tells me I'm supposed to, but I never received a positive ovulation test when I was supposed to... So now, I getting really worried my body isn't ovulating? Im going to try a different brand next month.

I've always had normal paps and exams, I've had mild pains but I thought that was just cramps, I'm wondering if it's something more.

Has anyone else gone through this?

I don't want to tell my Fiancee yet without getting more information and seeing my doctor.