Is it possible for an ultrasound to miss twins at 8 weeks ?

I had an ultrasound at around 8 weeks and it was a quick “just confirming that you’re pregnant” ultrasound. She said it’s just one baby, but for some reason I keep having these intense dreams that it’s twins ? It’s not possible for a twin to be missed is it ? I know I sound stupid and crazy I just want my mind eased without going to the hospital.

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