I have so much audio messages
That is great! Most states in the US are at-will employment states so the burden is on you to show proof if they're violating employment law. Any emails, texts, and audio will help you prove that you were being discriminated against (potentially). You should be able to get a free consult with an employment lawyer where they can review your case and let you know if you have one.
If you voluntarily quit, you would likely not be eligible for unemployment. I would contact an employment lawyer ASAP. Maybe you'll have a case for discrimination due to being a working mom if there is proof they agreed to something and of the harassment. Just reference for next time, never ever quit. Even if they are giving ultimatum after ultimatum, make them fire you because you'll be eligible for unemployment and have an even more solid paper trail of harassment. Even if they are point blank asking, state that "you intend to continue to fill your role." Make them get rid of you.