AFAIK, for levels 1-9 you'll get (Fighter HP + Mage HP + Thief HP)/3 Hit Points, which fits nicely with your current HP.
For levels > 9 you're rolling a 1D2 dice each level up.
Oh, and BTW - when casting Find Familiar, you get additional (Familiar's HP)/2 hit points - so the Fairy Dragon actually gave you 12, not 24 hit points.
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