How to show error if client did not click check, but with not default value

I am trying to show error message if client did not click checkbox, but it shows the error message by default.
How do I manage to show it only after submission?

const InputForm=()=>{
    const [value ,setValue] = useState("");
    const [check,setCheck] = useState(null)

    const getValue=(e)=>{
        setValue(e.target.value);
    }

    const getCheck=(e)=>{
        setCheck(e.target.checked);
    }

    const handleSubmit=(e)=>{
        e.preventDefault();
        const emailValidator =/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/
        if (value.match(emailValidator)) {
            console.log("Valid");
        }else{
            console.log("Invalid");
        }
        
    };

    return(
        <form className="inputForm" onSubmit={handleSubmit}>
            <div className="tos" >
                <label className="container">
                    <span>I agree to <strong>terms of service</strong></span>
                    <input type="checkbox" onChange={getCheck}/>
                    <span className="checkmark" ></span>
                </label>
                <p style={check?{display:"none"}:{display:"block",color:"red"}}>You must accept the terms and conditions</p>
            </div>
            <Footer/>
        </form>
    )
};

>Solution :

import { useEffect, useState } from "react";

export default function App() {
  const [checked, setChecked] = useState(null);
  const [error, setError] = useState(false);

  useEffect(() => {
    checked && setError(false);
  }, [checked, setError]);

  const handleSubmit = (e) => {
    e.preventDefault();

    if (!checked) {
      setError(true);
    } else {
      // do what you want
    }
  };

  return (
    <form className="inputForm" onSubmit={handleSubmit}>
      <div className="tos">
        <label className="container">
          <span>
            I agree to <strong>terms of service</strong>
          </span>
          <input
            type="checkbox"
            onChange={(e) => setChecked(e.target.checked)}
          />
          <span className="checkmark"></span>
        </label>
        {error && (
          <p style={{ color: "red" }}>
            You must accept the terms and conditions
          </p>
        )}
      </div>

      <button type="submit">submit</button>
    </form>
  );
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>

Here is a solution :
https://codesandbox.io/s/crimson-field-m6j5h?file=/src/App.js

You should have a separate state for the error and render the message only if that state is truthy.
That state should be set when calling you handleSubmit function.
To remove the error message when the checkbox is checked, you can listen to it in a useEffect hook.