HCG level

Tori
So my dr just called and said my hcg level is at 17. My last period was the 23rd of January. I have to go back tomorrow for more blood work to make sure my levels are doubling. Is this something I should be worried about? This is my first pregnancy and I'm not sure on most stuff. I'm about two weeks along. Any input is appreciated. By 17 I mean 17,000.