irregular period

I take two birth control packs in a row to minimize my periods because they are painful. So I get a period every other month, average cycle is 54 days. 
Over the last few cycles, my periods have been extremely light, short and always start with brown. The period I am supposed to be having now has been nothing but a light brown discharge , but I have all my regular symptoms(headache backs aches cramps) like my body is trying. 
I also have lost 20ls (I am at 150, which I don't consider that a low body weight) this year and increased exercise and  new healthy lifestyle. Could once a once regular period be affected by the changes I have made this year?

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