how common is it to skip periods on low estrogen birth control?

I've almost finished my second pack of Gildess 1/20. It's a 21-day pill of 20 micrograms of estrogen. I skipped my first period entirely and am nervous about skipping another (I waited seven days before starting the new pack). How common is it to skip periods and when should I start to worry about missing periods? If I miss this next one, I'm planning on consulting my doctor. 

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