1. No, they have to be positive but you must also realize that some may test negative during the window but they are still positive.
2. No, not if they are negative so same as answer 1.
3. I will let someone else answer that because I am not completely sure about symptoms. One thing you should realize is that Anxiety can have similar symptoms.
4. Do not go by symptoms, they are not very good indicators.
Thank you very much . And i also posted one more thing yesterday in the heading please reply. if you dont mind could you please clarify that question also...
Thank you in advance.