Nightmares

36 weeks and I'm having nightmares. They are really vivid. Mostly about smoking weed, I'm sober, but it's been about me smoking weed again and I automatically hate myself after I smoke in the dreams.  And last night it was my husband kissed another woman in front of me. I'm not a jealous person, and he would never cheat, so idk why I'm dreaming about this. 
Is it normal to have nightmares this vivid ?