Recall shows Choose a Plan when the household you're currently in doesn't have an active plan. Your records are safe either way.
You're in the wrong household
New accounts come with a household of their own. Open the household menu and use Switch households to go to the one with your pets.
You haven't accepted your invite yet
Look for the invite banner at the top of the page and enter your code. Don't subscribe; the inviting household's plan covers you. Accept a household invitation.
The plan was cancelled or a payment failed
The household owner can check and fix this in Billing. Manage billing.
You just need your records
Even without a plan, you can download everything you've logged with Download all your data → on the plan page, or from Settings › Your data.