Has anyone else experienced this?

Brooklynn • 23, married, mom to 2 wonderful boys, Mason and Tristan, and a 3rd boy is due July 9th, 2020.
Okay so this is my first ultrasound that I had done at 6w2d but the baby only measured 5w6d. 
This was my 2nd ultrasound done exactly 14 days later and the baby measured 8w2d. I was just wondering if anyone else had experienced such a growth like this and what was your outcome?