I used to be a Thursday starter, but for the first time ever since I started this pill 3 years ago I skipped my Placebo Pills to become a Sunday Starter (I'm on a pill that only has 4 days of iron pills). I was wondering if skipping my placebo period and instantly starting a new pack could have anything to do with me having an upset stomach? I've never had problems with this pill making me sick before, but just wondered if that could be it.