I have to disagree with persey.
Alot of people get false negatives, the truth is.. Alot of people will never get a positive birth control test.
Also, persey... I am not sure where you are getting your information from but she is showing all the classic signs of early pregnancy. The harder stomach, more saliva, tiredness, more than average discharge, nausea, and most obvious of all, no period.
There is a very very very good chance that you are pregnant. When was your last period due? I would strongly recommend going to a doctor and getting a blood test done... That will tell you if your pregnant or not. I am estimated to be about 6 weeks along and I have all the same symptoms. Good luck!