HCG levels

Posted the other day about my first HCG number (82 which dr said was low). Got my results back today and its 173 which means it doubled. 
The nurse said to schedule my next normal bloodwork and come back at 8 weeks, so not concerned. However when I look at my results online the test results are "flagged" meaning not normal. Should I still be worried? I'm about 2 1/2 weeks after ovulation (ovulated on day 22 of my cycle)