Late anatomy scan tomorrow!

I did not have one when I was 18 Weeks due to insurance issues, but getting one tomorrow at 30 weeks. I had one with my son , but only because I had a small chance of him coming out with DS, luckily he doesn't have it! But I'm having an ultrasound with this pregnancy because I'm so late in pregnancy and never had that blood test . anyway, would they be able to tell me how big she is? Like weight wise? I cannot remember if was told anything about my sons. Would they be able to let me know if everything turned out okay?