DH almost died! I opted for the early U/S I was having... issues connecting to this pregnancy, which seeing the HB on the screen totally connected me to this little bean!
Anyway, the tech was checking things out, my cervix, etc, she was looking at my ovaries and mentioned that it looked like I conceived from my left ovary, and showed me where the egg erupted, and talked about how that was good, and the progesterone will help keep the pregnancy until the placenta takes over, etc. Then she was checking the other ovary and said "Oh, it looks like you ovulated from both ovaries!
She quadruple checked that there was only one baby
On the way home poor DH was talking about "what if" situations, like "Can you put three carseats in the Volvo" It was cute.