I skipped over … [Dawnguard DLC spoilers (I think)]

I skipped over the entire Serana vampire line I think. After I rescued her and we went to her family’s castle, I rejected the vampire offer and left.

I want to do a separate character as a vampire and follow that quest line through from start to finish so I left this one for now.

I’m playing as a stealth archer mage. I play for my bard dreams by doing the deeds of the Thieves Guild and Dark Brotherhood.

Will I regret sidestepping this whole side plot?