Fluff ... when i was on the pill years ago only time i worked out was ok (?) to skip would be when i went on holidays (omg who wants a period on a holiday i thought ) about every two years or so.

Well, i did skip two cycles in a row once and oh i felt so awful as my abdominal area became bloated or swollen looking, never did that again

I personally wouldn't make a habit of skipping that's all