Harmony test - no reading anyone else had this?

I got a call from the consultant today & they couldn't get any results from the test. He said it could just be that there wasn't enough of it in my blood or it could mean there's a problem. I'm seeing the consultant on Weds evening & he's going to do a thorough scan to see if he can see any problems & then take bloods to send off again & hopefully we will get a result. Will then need to wait another 7-10 days for blood results. Im trying not to worry but I'm really scared there's something wrong. Has anyone else had this and if so what was the outcome?  Thank you.