What could be the issue?

Okay, so I’ve been trying to conceive for a while now. I’ve gone to the doctor to do blood work which was normal. And my uterus was positioned in the right spot too..

I started <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a>. I got two positives last week. If I don’t become pregnant, what could be the issue?

I haven’t used birth control for about 6 years now, I’ve never been pregnant.