[@Dark Cloud]

We're doing average HP per level (but maxed at first of course). So you should have around 26 HP, 6 from Max first hit die + 6 from toughness (2*3levels) + 8 from average d6 for two levels which is four each + 6 from your con bonus times your level (2*3). So 6+6+6+8=26.

Sorcerer's don't get a lot of HP do Toughness will go a long way to make you a bit hardier than most.