When do you start freaking out

When do you start freaking out that you might be pregnant? When you experience one symptom? Or when you know it’s been a while since your period plus symptoms.

I’m on birth control and always use condoms and they haven’t broke in the past several months so I should not be afraid, but it never fails, I have one symptom and then I think I’m knocked up. Even took a pregnancy test today and it’s negative but that could just be an early test