Am I going to lose my baby? took a pregnancy test that came out positive... But these are the wierd things happening... 

1. It hurts when I walk or go to the bathroom...
2. Constant abdominal pain from side to side
3. Shoulder pain
4. Stress
5. Usually when I am pregnant I spot, I have not had a period in 1 month in a half, nor have I spotted
6. Nausea, but it isnt as bad as it was. 
7. Dizziness
8. White Thick discharge

I am only 6 weeks pregnant, so therefore I should still have "morning sickness", but the "morning sickness" symptons are starting to disapear slowly. I have been pregnant before, but all 3 of my pregnancies were not like this one... In fact I didn't get sick with my other pregnancies, nor did I have these symptoms. Should I be worried? Am I still pregnant or did I have a miscarriage?

Summarized question: How to distinguish the symptoms of pregnancy or miscarriage?