Remember those estimates are a best guess not a guarantee! They're wrong all the time! Unless a medical condition is present, it's very rare for your body to make a baby it can't birth.
Hi, I had my first daughter at 24 weeks and she was 700g, on the bigger side but still very normal (estimated 8 1/2lb if full term)
So sounds very normal to be 890 2 weeks further along :)