Your consultation with an attorney for the purpose of obtaining legal advice or representation, provided no third parties are present or listening in with your permission, is always confidential whether or not you actually retain that attorney. There are a few exceptions to the rule but your question does not implicate them.
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One thing to add to my colleague's excellent answer -- Expressly confirm with the attorney that the conversation is "privileged" so you know that you are both on the same page.
This answer does not constitute legal advice nor form an attorney client relationship. I am not your lawyer. If you have a legal issue in Maryland, Virginia, or the District of Columbia, you may contact me for a free consultation.
Generally, even a consultation with an attorney over the phone is covered by the attorney client privilege.