Adjustment of Status - I-485

Hi my husband and me just went to the interview today. The officer called our names and took us to his office, then told me to look at a camera and took my index finger prints. He asked us a lot of questions, and I didn't know the answer of 1. He kept our bank statements, phone bill, life insurance and 1 picture. At the end, he said everything seemed to be good and if they don't need anything else, I will get my green card within a month. So, does it mean my green card is approved? He didn't stamp anything on my passport, didn't give any papers, and said that we just needed to go without doing anything. I'm so panic. Please let me know. Thank you.