First scan nothing seen

Brittany • Married💍 1 amazing little girl 7-9-19🤱🏽

Anyone go for a first scan and see nothing at all and go back a week later and you actually are pregnant? My HCG is doubling appropriately but they were unable to see anything today in my ultrasound as in no sac nothing, stories please! I know i ovulated late, hopefully just implanted late and I’m earlier than I thought!