Tested positive for Syphilis

I just got a call from my provider that I need to go back to do far blood work becuase I  tested positive for Syphilis. I was in shock and didn't ask questions I don't believe my husband has been unfaithful so I google it and seems that it's common for pragent women to test positive for Syphilis and turn out to be FALSE but just freaking out now!!! And was wondering how many here have had this happen to them