dreams

I've had very vivid dreams this pregnancy but last night I had one I would've rather not had, dreamed I was holding a sac with baby in it and it was so tiny but could see its heart beating. I had a miscarriage in June and it terrifies me don't know if reading people's stories of loss or my fears caused the dream. Praying it doesn't happen we saw the heart beat and heard it at 6weeks 1day don't have another ultrasound till the 11th. Anyone else have these kinds of dreams?