My son isn't my son.

I'm in my 30's with a daughter(10). I also have a son(12) who I've raised and supported since he was four months old. Three months ago I got a letter in the mail that said a woman was claiming my son was actually her biological son and had been switched in the hospital. <br><br>It was impossible, I've seen lots of horror stories in the news about it but thought it was just that, and I'm pretty sure my wife had a c-section. Well I took my son to get a DNA test done and well you guessed it, he's not my son. I'm not sure how it feels at this point. A few weeks ago I told my wife and it's been a roller coaster of emotions. I'm just not sure what to feel or think at this point. I know in my heart he is my son, but am I truly his father? What if my real son is out there?