Measuring behind?

Ashley • Avoiding pregnancy. 3 losses (6, 16, 15 weeks). 1 earth son, Lincoln born at 26 weeks. Just turned TWO & doing great!
I had an ultrasound at 6,8,9 weeks, I went today for 10 weeks and the baby is behind by two days. Baby was moving like crazy and  heartbeat. But I am paranoid about those 2 days. I have another ultrasound on Friday I hope baby measures back up. I am just feeling so depressed. I have lost 3 already