The 3GBs/Unlimited talk/texts takes precedence over whatever you have on your regular data/talk/text buckets for the 30-day period that monthly plan applies. So no minutes or texts are discounted from the regular buckets until the monthly plan expires and you revert back to you regular "PayAsYouGo mode". And you expiration date gets extended for 30 days too. That's been my experience.
If you have some data left from the monthly plan when it expires, it will roll over for 30 additional days. But in this case I believe you get data discounted first from your regular data bucket before you tap into the leftover data from the monthly plan. Not sure if that's how it work though. I think I read it somewhere.
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