Pregnancy?

I had some questions relating to being pregnant. Kinda want to no truth from myths or false statements.

1)can u run? Or does it have to be light cardio not intense cardio? Cause I heard ur heart rate has to stay below a certain level.

2)can you eat spicy foods? I heard u couldn't cause it can cause a skin condition when ur baby is born

3)pasteurized or unpasteurized cheese? Can u eat it? What's difference? I heard u couldn't eat certain cheeses just not sure why.

4)laying on ur stomach? Until how many months can u no longer lay on your stomach? I heard some say never other say until 5weeks.

5) if u had a miscarriage and are prego again is it risky to work? Especially when it requires u to be on ur feet for 6 hours straight. Mixed thoughts on it.

6) stress ? Can it really be dangerous when prego.