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The RDS Free Tier covers specific instance types and sizes and up to a specified amount of storage. If your usage is not in line with those, then you will get charged. Also, the RDS Free Tier is only for the first 12 months of your account [1].
To see what your usage is, you can see this on the RDS Service Dashboard.
Alternatively, you can see this in Cost Explorer. (Instructions [2] for enabling Cost Explorer, free with default settings). Filter (right panel) Service for RDS and Group By (top bar) for Usage Type should tell you what instances you are running and how much the storage and instances are costing you.
[1] https://aws.amazon.com/rds/free/
[2] https://docs.aws.amazon.com/cost-management/latest/userguide/ce-enable.html
Hi, according to the wording on the AWS Free Tier page, for RDS you are entitled to:
750 hours of Amazon RDS Single-AZ db.t2.micro, db.t3.micro, and db.t4g.micro Instances usage running MySQL, MariaDB, PostgreSQL databases each month. 20 GB of General Purpose (SSD) database storage
It may be that you've used an instance type other than those listed, you've enabled multi-AZ or exceeded the 20GB storage limit.
