Find out if it's possible to carry a "hidden twin" and whether it can be detected with ultrasound imaging.
I had an 8 week vaginal ultrasound were we saw 1 baby and everything was I had a fourth u/s at 10 weeks - twin babies! Hidden Twin. 0.
A transvaginal ultrasound checks your babies' heartbeats and more.
That's when we found out about our “hidden” twin! 7 week ultrasound only saw one baby (ultrasound done both abdominal and vaginal).
During the ultrasound he could only see 1 sac and 1 baby. He used Apparently twins can hide behind I e another completely for up to 29 weeks. The trans vaginal ultra sound, or the wand as you are calling it, doesn't get moved around.