Preg detection earliest

[504RP]

My wife had two mare's AI. Was told to bring them back in one week to see if they took ? Is it possible to tell that soon wether or not the horse is bred ?

 

[Cowsout]

Way back when I did equine practice, I could detect an embryo at day 10 post-breeding via ultrasound. I assume the equipment is much better these days.