Single umbilical artery

Anyone had this? At my 20 weeks scan they only found one artery in the cord and said maybe saw the other but not for sure. They wanted to recheck me in a month but I pushed for sooner and they’re sending me to high risk in a couple weeks. I pray they just missed it and it’s there. They acted like it’s no big deal but I read horror stories online. Please pray for my baby and me. 🙏🏻