A member asked:

Im on yaz, (drospirenone and ethinyl estradiol) i used to have period the last sunday of the end of packet, now it changes to friday or saturday, what can be the cause?

A doctor has provided 1 answer
Dr. Jeff Livingston answered

Specializes in Obstetrics and Gynecology

That’s ok: It does not matter exactly which day you start your cycle. Getting to the end of the pack and the last 4 pills in Yaz (drospirenone and ethinyl estradiol) is what triggers the cycle. The exact day varies.

Answered 9/6/2015

2.3k views

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