Had sex little over a week have light cramps feel sick like vomitting have clear/white mucus discharge and feel sick when i smoke?

Stop smoking: First, stop smoking. Most people succeed at this by gradually cutting down then stopping completely. If you are concerned about pregnancy (it's possible) then get a home pregnancy test, which usually is positive by the 1st day of a missed period.

Possible pregnancy?: Perhaps get a pregnancy test first. Then if. Negative see your doctor if you still feel ill.