This article originally appeared on Jessie Stephens' Substack, Dwelling. Sign up here. The ultrasound technician went very quiet a few minutes into my seven-week dating scan. I was alone and nervous.

Flip a coin. When it comes to twins, the odds of how they’ll be positioned at delivery time (head down, feet first, or buttocks locked) are anyone’s guess — which means you may be left guessing as to ...