But, it's different with every person whether or not you will still have breakthrough bleeding, your cycle, or just skip it.
I am on Loestrin
I did that and
I spotted for a day, only when I wiped and that was it. I didn't bleed until my next cycle.
It's not harmful, unless you continue to do this for every cycle. But, I was told by my doctor it was ok for special things, like vacation, wedding, etc.