Though its not vaginal tearing, it is not uncommon to bleed once the hymen is broken. In fact, its almost rare not to. Though a lot of girl's hymen's aren't intact when they lose their virginity, your girlfriends may have been. Some girl's hymens can actually contain huge blood vessels, so when they are broken, they lose a hell of a lot of blood. I'm pretty sure that in your case, the hymen was broken the first time, though perhaps not all the way, and the second, it just broke some more. Seriously, not really anything to worry about. Definately get a second opinion, though.
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