What's mobile data current period?

I've just got an iphone 5c around 5 days ago and i had 750MB and priviously the company sended me a text saying that i only have 51MB left, but then i go on my settings in the mobile and i see 'current period' and it says '473MB' what is that is it how much i've wasted so i have like 200MB left if thats what it is why did they text me that i only got 51? Can please someone explain what current period is please?

Current period in that case if how much was used since it was last reset/started keeping track of it.

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