Not to mention you should check the local laws because it may be illegal to record other people depending on the state.
It's not illegal as long as you are a party to the conversation. I just learned this while watching "Bombshell" over the weekend. Here's a blurb from a law office's web site:
Quote
Federal law permits recording telephone calls and in-person conversations with the consent of at least one of the parties. ... Under a one-party consent law, you can record a phone call or conversation so long as you are a party to the conversation.
Now whether the recording is admissible in court is another matter entirely, and does vary from state-to-state. But if you are just recording for your own personal use later as a "sanity check" as it sounds like MrBrside was, that's perfectly legal.