In order VScode detect a new Python environment you have to setup "defaultInterpreterPath" in your workspace settings please use following steps to modify your settings file,

 1. Go to menu File → Preferences → Settings.
 2. Click on Workspace settings.
 3. Under Files:Association, in the JSON: Schemas section, you will find Edit in settings.json. Click on that.
 4. (For Mac/Linux):  Update "python.defaultInterpreterPath": "Your_venv_path/bin/python" under workspace settings. 
     (For Windows): Update "python.defaultInterpreterPath": "Your_venv_path\Scripts\python.exe" under workspace settings.
 5. Restart Visual Studio Code in case if it still doesn't show your venv.
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