Hcg levels at 16dpo

Michelle • 33 year old from Australia , currently pregnant with baby #4 a boy..miss 7 mr 5 miss 1 and prince due 26/01/17
So just had my 3rd lot of hcg done .
10dpo 48
14dpo 476
16dpo 1291 
Seems rather high !! 
Booked in for a scan at 5 weeks 5 days