C# Check Physics.Raycast Once

I would like to make an if statement that checks if Physics.Raycast only detects a gameobject once instead of checking repeatably. Is there a way to do this? I know that the update function is constantly checking so I don't know how to get around that.

 using UnityEngine;
 using System.Collections;
 
 public class Example : MonoBehaviour {
     void Update() {
         Vector3 fwd = transform.TransformDirection(Vector3.forward);
         //Check only once
         if (Physics.Raycast(transform.position, fwd, 10))
             print("There is something in front of the object!");
         
     }
 }