Inconclusive Blood Test For Gender

We just waited (very impatiently) for our genetic blood test results to come back to tell the gender of our baby. After two weeks of waiting, I got a call from the doctor today, they informed me that the test results were inconclusive... I am 13 weeks pregnant today, having to go back to the doctors for a second round of blood work for the same test. This is my second pregnancy after a miscarriage last year (the pregnancy ended at 7 weeks), so as you could imagine my mind is going crazy. Has this happened to anyone before? What should I be worried about? Should I be worried? Of course, google makes me think the worst of everything and waiting another two weeks to find out any result is going to kill me.