Love the idea but not a success for me

I purchased Daysy because I absolutely loved the idea of it, the science behind it, and the fact that it was natural. Unfortunately I did not personally have success with it. I used its guidance for family planning and my husband and I were blessed with our first daughter when we weren’t quite planning yet and then it took 5 months to get pregnant again when we were planning. I know everyone’s bodies are different and I’ve read others who’ve had great success with Daysy, I just think maybe the algorithms didn’t line up with my body’s true timing of being fertile. Based on when I got pregnant with both daughters it turned out that I was “fertile” after the Daysy actually said I was. I just wished I could trust it to continue using again now that my second daughter is here.