In my opinion, it's a bit complicated.

I personally think taking ONE kind of test, with ONE set of questions, only ONCE, has some big limits. What if the questions weren't clear? What if the person taking the test was worried/anxious/sad/tired etc. and that didn't allow them to think clearly? What if the questions of that one specific test didn't address other significant symptoms? And we could go on and on... This is why a test doesn't necessarily define your situation, or you as a person. Most of the time, it really doesn't. (The greatest example of this is the IQ test, but that's another story.)
Moreover some of the symptoms of depression, anxiety and PTSD are actually the same or pretty similar.

However we should also consider that people who suffer from depression usually don't realise it. Of course if - for example - a person is feeling suicidal and self harming that's kind of a sure sign they suffer from depression. But in other cases it might not be as easy to diagnose. I don't know your story or current situation, but if I had to give you advice, I'd say to wait and see. Maybe talk about it to your GP/therapist.

Best wishes