Yes there are a bunch of DNA discussion boards on Ancestry.
Go to Collaborate > Message Boards > Topics Categories (click More Topics Categories) > DNA Research > choose from among 7 DNA topics boards.
But I thought you said you have a line of ancestry not known? Oh well, maybe you didn't. I guess I need coffee! Short story is the message board won't know if your DNA test is right or wrong. The paper trail is needed first.
Also the possibility exists - of a non-paternal event. Sometimes the true parentage of a given person has never been said out loud (the person was adopted, or the offspring of an out-of-wedlock affair, etc).
http://boards.ancestry.com/topics.dnaresearch.autosomal/477/...I posted previously a link to the Find-a-Grave memorial for Leonhard Reiswig (1812-1902) and Johanna Philippine Neumann (1819-1896).