If you have your birth mother tested, you can "phase" the results to distinguish your paternal and maternal matches. To do so, you can use a free site called gedmatch.com. There is a separate message board here and people are very helpful. You can also contact Jeff Snavely at firstname.lastname@example.org
. He has a Chrome Browser extension that you can use to analyze your Ancestry matches, including separating out your mother's matches.