Did I miss it 🥺 HELP!

I’m so confused.....

I got a smiley face for the clear blue opk on CD13 so I BD at 2AM. I continued to test with my cheapie opk’s. It said I’m high in the morning of CD15 and when I tested in the evening it said low. And I do see the line got lighter.

First question! How many days am I fertile when getting a smiley?

2nd question, I thought the fertile window is for 7 days. Should I continuing baby dancing? I only bd once since my high peak.