How to see if I went over my internet data with AT&T?

I have an iPhone 5 and the carrier is AT&T. I can only use 3MB for the internet. If I ever go over a MB, I get text message from AT&T saying I went over.
I haven't gotten any texts saying I went over. My mom claims I went over 5MBs. How can I check if I went over or not and how much MB I have left.

There's an AT&T app you can download. All you have to do is make an account and it tells you there how many minutes and data you've used

If you go into your General Settings, you can check your Cellular Usage.

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