A week is too short a time
It's a skill that will improve with repeated use. I could give you some tips about how I improved the lucidity level in my dreams:
1. Keep a dream journal and document your dreams with as much detail as possible.
2. Optimize your sleep pattern (like, never sleep until you are sleepy).
Regular practice and journaling will improve your dream recall and also make you calm when you discover that you're lucid. It's perfectly normal to lose lucidity quickly in the first few lucid dreams. However, as I said, it
will get better. Just hang in there.