You cannot judge your winnings over 1 Session alone.
Some of my sessions are -170B/100, then another one 200BB/100, sometimes i'll break even.
You need to look at your BB/100 over a good sample of hands.
Take my last few sessions as an example:
36BB/100
-1BB/100
-44BB/100
78BB/100
-49BB/100
40BB/100
35BB/100
You cant judge your play on any of them sessions, i've only just started playing this limit so at 3500 Hands i'm 11.5BB/100. None of them sessions are even close to that! But i'm still at a small volume so if i were to lose a couple of buyins it would change dramatically.
Hope that clears it up a bit