I had a dream similar twice at about 16wks it was so vivid freaked me out! Its prob just our worries creeping into our dreams
You know what I tell myself when I think too much?
"A dream is nothing BUT a dream & a dream is NOT Reality. I am living in the here & now. This IS the present, this IS reality" This serves to stop me from focusing on my negative thoughts & I do my deep breathing exercise.