Can you say how likely this game is fair?

Hello Wizard.
i flatbetted 1 unit at BJ game with 99.5% return for about a month.



Sample size may be small.Can you say mathematically how likely this game is fair ?
Session 7 number suppose to happen only 1 in 5000 if this game is fair.
Total loss happens only 3% ,2 sigma event.
I know it can happen in fair games.However out of 8 session 3 sessions were ended with more than 1 standard deviation loss .
One is more than 3 standard deviation loss.I feel it is less likely a fair game.
I want the opinion of someone like Wizard who has deeper mathematical knowledge than me.
Please do not comment about negative expectation of the game.I know I lose 0.5% from the game itself in a long run if it is fair.
It is not the point of the question.

	Hand played	P/L	Probability of Loss
Session 1	540	-40	7.99%
Session 2	486	-40	6.78%
Session 3	90	+12
Session 4	270	+4
Session 5	72	+10
Session 6	36	+10
Session 7	216	-60	0.02%
Session 8	158	+5
Total	1868	-99	3.46%