ultrasound

I take it you're planning on using a real, live ultrasound machine?? 

I'm not sure if you've been present during many ultrasounds but it's often difficult in the early stages of pregnancy to make out much at all - even when you're sitting practically on top of the screen.

Do the audience need to see the screen at all? In most cases I'd expect their attention to be on reactions of the actress being scanned. Which might mean that she faces us and a screen that we can't see.

Otherwise, you could try running someone's video recording of a positive scan through the screen.

Regards
Grant

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Director, actor and administrator of this website