Hcg levels rising fast! Sonogram pushed up a week

Sam💫 • Miscarried first pregnancy early March 2015 at 5.5 weeks. Expecting our rainbow baby Feb. 2016 ❤️
I should be around 4 weeks 5 days based on my last cycle which started 5/1. My levels seems to be rising pretty fast so my OB just moved my appt up by a week to June 9th! My levels are below, any thoughts? Do you think we will see anything this early.. If everything is progressing the same.. My hcg level should be around 15,000
-5/26: 60
-5-28: 131
-6/1: 749 
-6/3: 1942