Questions about measurement

Aja
So long story short I was in the er and the doctors said everything was normal but my baby measure 16+4 on ultrasound I was 17+1 does this mean anything? 
Longer version, I had one sided vision loss, and headaches and a very hard time breathing that I went in for originally my bp was fine everything was fine. A few days before I had cramping and like one drop of blood, I've been very sick not able to eat or drink anything and I've lost 25lbs. No one says anything is wrong, I've been to two different ers and my ob, and a eye doctor.. My family has very high risk for stroke and heart issues. But I'm "100% normal according to all the tests.." 
I didn't think much of the small measurement because of everything else that was happening that day but has anyone had that issue? Does it mean anything?