First abdominal ultrasound?

Alisha • Gave birth to 🌈 baby April 2020 👶🏼

Hey everyone!

I am 5w6d pregnant with our rainbow baby. I never got far enough the first pregnancy to go to an ultrasound. I am wondering: when a person can go for their first abdominal ultrasound? How early would a fetal pole (or anything else like a yolk sack) be visible?