Nasal bone

Allyssa • Married to Steven. Mommy to Paisley Rose 11-07-16. Kellan 06/19 and baby 3 due 7/27
I had my anatomy scan today and the tech said she couldn't see the babies nasal bone yet, but that she didn't see anything concerning. She said everything is still really small on the baby right now, but I know others at this point in pregnancy who have seen their babies nasal bone. I was measuring 19 weeks and 3 days. 
I'm so worried and upset. Everything else about Paisley looked totally normal. Does anyone have anything they have experienced that could be reassuring? I just don't understand why she wouldn't see one so far along...