Ultra sound 11/16/17

Ashley 👼👼💜 • Married to my best friend with twin angels watching over us (miscarried new years day at 12w3d.)

Had my first ultra sound today i was 5w6d as of yesterday. But my OB said we wouldn't get another until 20w is this normal?? Here's my first ultrasound picture... Babies just a small speck but defiantly there.