Are missed periods a common side effect of Yaz BC pills? I could not find it as a common side effect in literature on their website, but I have missed 2 periods and have negative blood and urine pregnancy tests. I have been totally irregular (bleeding for 1-2 weeks at a time) more than once a month since I have been on Yaz (about 6 months), but never have I missed a period unless I was pregnant.
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Hormonal contraceptives can cause some women to miss a period especially during the first couple of months while adjusting to the hormones, but like most pill inserts will tell you, if you miss two periods in a row, it is important to speak with your prescribing doctor.
Also, it is pretty common to have "break through bleeding" while on "the pill" especially while your adjusting. (that's the bleeding you are describing). You need to see your doctor. You may need to try another pill.