Bad Dreaming !!

I don't know why always i dream that i have sex or somthing like that i awake in bad mood .. 
I don't know why my dreamz like that !! I hate to get sleep becuase of these dream..
I try to avoid anything that maybe think to feel to dreamz like that!!
Anyone same case & any idea how to avoid bad dreamz when i awake i need to take shower and sometimes i have a stomach pain.
Impregnant in week 8..