I found a condom wrapper in DS's room. His girlfriend had been over, they had been in his room with the door ajar (!!) but still managed to do it. I took a few days to cool down then had a conversation with him about consent, safety, and also made the point that I wish he had waited. That I loved him no matter what but that I thought he was too young. Checked in that he cares for her and understands his responsibilities not just physically but emotionally. He sat and looked me in the eye and although was mortified, he didn't run away either, and said all of the "right" things. We then had a nice day together.
I can't shake the feeling of sadness though. Any one else going through this?