I read in another post that if you get the Dragon scroll before doing it in the main story that it breaks the quest? I just gathered the Elder Scrolls for the Dawnguard quest but I have yet to start Skyrim's main quest. Did I just screw my self?
That may or may not be true, but getting quest items like these before you're supposed to does tend to break the quest that they are related to. Obviously they are assuming that all players who are embarking on the Dawnguard questline have already completed the MQ of the base game. They may fix it in future, but I'm not certain if things like this can be fixed, though, at least not without having to lock you from continuing the Dawnguard questline until you get to that point in the vanilla MQ, which isn't going to be an overly popular decision. But neither is making the questline in a way that you can break the MQ of the base game, so they've got themselves a very big problem on their hands, not to mention a kind of poor design decision to make both questlines rely on the same exact quest item. That is if there actually is a bug.
The possible bug is mentioned in this thread: http://www.gamesas.com/topic/1389814-dawnguard-bug-list-1/
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