HCG 15 at 11dpo

MrsWW
Please help, I'm so nervous I'm going to lose my first BFP. Is 15 at 11dpo okay? 
Didn't have my usual doctor today (don't really like the man I saw) but he told me that he thinks this is a chemical and my levels should be closer to 300. Everything I've read says this is wildly inaccurate. 
These are the first bloods I've had drawn so he has nothing to compare it to (i.e we don't know whether they're going down or not). Thank you