Its a dip in both oestrogen and progesterone that cause your period to come. Since this is a progesterone only pill its very likely to make you miss a period, and since you havent had sex since May, I wouldnt be concerned at all about pregnancy.
Not taking it for a few days might or might not cause your period to show up because it depends on how much you have in your system as to how long it would take to dissipate from your body. Depending on how much progesterone is in the contaceptive, it could take longer than a few days for it to fully get out of your system and for your period to arrive.
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Date: 2008-09-11 01:20 am (UTC)Not taking it for a few days might or might not cause your period to show up because it depends on how much you have in your system as to how long it would take to dissipate from your body. Depending on how much progesterone is in the contaceptive, it could take longer than a few days for it to fully get out of your system and for your period to arrive.
Hope that helps :)