Yes... totally normal. I could tell you all about the nervous system and the endocrine system and how the male sexual reproduction system isn't like the female reproduction system because men need time to recharge.
Here, think of this: have you ever came a few times in a day and your ball just ached for it? Well, girls don't have that, its a little easier for them to go longer unless muscles start giving out or something like that. That you're coming so hard that you can't stay hard - she should be happy, that means it is good (better than masturbation, I assume, where can probably keep going until the cows come home). Don't worry about it, unless you can't get hard at all.
Another question: how long does it take to get hard again after that happens? If you can get hard again within an hour or two then you're fine... if it takes a lot longer, then I might start to get worried.
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Innominate.
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