Is it safe to use Norco (hydrocodone and acetaminophen) 10mg as prescribed for pain while 6wks pregnant?

No. The clear recommendation is to ONLY resort to it if the potential benefits outweigh the risks to the fetus. So, it's a judgement call. Definitely talk to your OBGYN before taking it and seek alternative means of managing pain. This will be valuable to you over the near future at least. Best wishes for a healthy birth experience.