Can i skip the last week of my estrostep (ethinyl estradiol and norethindrone) fe birth control pills?

Yes: The last week in the estrostep (ethinyl estradiol and norethindrone) pill pack does not contain hormones. These are the placebo pills, they do however, contain iron . Which is good for you, .

Yes if it's a 28 day: 28 day packs have the last 7 days which are non hormonal and not needed for birth control or cycle control. They do have some iron which can be good for you for other reasons.