Hi @ChristoffBotes
To check the plan open PowerApps, click gear icon, click Plan(s) it will show which plan you are on.

BTW you are on PowerApps for Office 365 plan and not on Plan 1 or Plan 2.
There are in total 3 plans:
1. PowerApps for Office 365 (least amount of connections but comes free with enterprise office 365 subscription for all users)
2. Plan 1 (all the premium connections, if the app has any premium connection all users must be Plan 1 not just developer)
3. Plan 2 (same as Plan 1 but for developers, comes with additional tools to model CDS and ability to see analytics for your apps)