Any ttc tips?

Hi, I have been off of birth control since February this year, we have not been using any protection for the past 7 months and I have been going off of the app for my most fertile days. But last month I used ovulation tests and got a positive test and we also used pre-seed and still nothing. Is there something I’m missing? Or does anyone have any tips that worked for them when ttc? Any advice is appreciated, thank you!