running hot at blackjack? dumb question

[acelah]

Hi i am a complete blackjack noob so please forgive me if this sounds stupid. I have been going to the casino after a nights out clubbing and have won 5 sessions in a row playing basic strategy and increasing my bet when i see lots of small cards, is this winning streak just variance or is this game beat-able?
they shuffle the cards after every 2-3 deals so there is basically no deck penetration i have also noticed they shuffle if there are lots of low cards am i just running hot, or can i beat this game?