This is reckless betting, good strategy, or pure luck ?

[Lustring]

At the end of last few visit, I found a betting method is quite well. 
Normally my bank roll is fairly small, 50 euro, even 20 sometime.  At the end, I reach 5 euro point.  Then I start bet on even bets, red black, even odd, big small.
Example:

I bet last 5 euro on black, win

Then I bet 5 on black , 5 on even, win

I bet 5 on black, 5 on even , 5 on big. Win

Then double every bet.

Basicly I double wining previous bet and return to base (5) bet if I lose that bet.

I do have a strong hunch when I preform this strategy. 

It worked well for the last 5 visits.  And I was making profit instead of loss. 

Just want to know anybody else has same exp or strategy. 

[Lustring]

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