i had a scan at 37 weeks with my son and they told me he was 7 pound 7 ounce , i had him one week later and he was 3690g which they told me was 8 pound exactly
with my daughter they told me at 36 weeks she was 2.4kg i had her at 38 weeks as well and she was 2.7 exactly, so there is i think they say 700g either side. at least ur bub is doing very well to be that big already hehehe