Should I be concerned if he didn't tell me first?

Do not to be offended or hurt if your son did not confide in you first, or early on in his discernment. Young people who are in discernment oftentimes keep their thoughts and their process of discernment confidential from the people who mean the most to them until they feel ready to put the experience into words and to speak about it face to face.

Rest assured that your son both needs and desires your support and encouragement.  In fact, your support as a parent is most likely valued more than any other figure in your son’s life.