Being billed for CloudWatch alerts (Free Tier), but cannot find any alerts to investigate further

Hi - I'm new to AWS and having a play around with the Free Tier to get a feel for things. So far I have setup MFA through the IAM Console, created some tables/entered data in them in DynamoDB, looked around a bit at some other things, but not configured anything else that I recall. Despite this, I have apparently exceeded the 10 free alarms in CloudWatch, but cannot find anything to display the individual alarms, or indicate what is causing the alarms, so that I can investigate further. No alerts, logs, or anomalies are showing across the entire time I've had the account (no errors, just no results).

After much searching online, I cannot seem to find the answer - how do see these alerts, and find out what is triggering them?