| Re: YAZ- 1st day ?
the reason they say to start at that time is so the hormones have kicked in by the time you are ready to ovulate for that month. The only risk would be if one had sex in that week before they started the pill because they could get pregnant. Otherwise there is no harm physically to start it a week late other than it may throw her periods off for a month or two, which to be honest starting new birth control is likely going to throw her periods off anyways until she has adapted to them.
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