It's common: Oral birth control pills contain a type of progesterone and a type of estrogen. The progesterone dose is fairly standard, but the estrogen dose varies between pills. Lower doses have lower potential for side effects but higher rates of breakthrough bleeding. Yaz (drospirenone and ethinyl estradiol) has a relatively low estrogen dose. If bleeding does not resolve (it may just resolve), then ask you doc about a different pill.
Answered 1/29/2016
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