Twins?

Elizabeth • Aubrey Rose 1/31/19 ❤️👨‍👩‍👧 Baby #2 February 2025

So I've been noticing lately that I can feel movement in my pelvic region and up by my ribs. I'm 20 weeks tomorrow and it feels like there's two even tho ultrasound tech confirmed one at 9 weeks. Could they be wrong and just missed the other baby? I've been reading stories that a second baby has been missed before.