question ab how soon the depo birth control shot is

	Asked by Unregistered (Female; 19; USA; normal, hereditary irregular periods; Relevant drugs:none ) on Tue 19, Aug 2008 06:06pm :
	i know the depo shot is immediately effective if it's given in the first 5 days of your menustral cycle, but if i don't have a regular period and it was given to me outside of that time...how soon is it effective? i recieved the shot on thursday aug 14th and my last period ended aug 1st... but they are generally ab three months apart..can you help?
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	Answer by Dr Simran, MD (doctor) on Tue 26, Aug 2008 11:05am: Hello curiougirl, Depo Provera is a hormone injection that lasts for 3 months to prevent pregnancy The first shot of Depo Provera is usually given during or a few days after the start of a menstrual period. After 24 hours, the shot is effective birth control for the next 13 weeks. Many women find it useful to schedule their next shot slightly earlier than necessary; if something prevents them from making their appointment, there will be a window of opportunity to receive their next shot. If you are more than a week late for your shot, use a backup method of birth control for the next two weeks. If you are more than a week late and you have had unprotected sex since your last shot, consider taking a pregnancy test before receiving the next dose. Refer http://www.fwhc.org/birth-control/bcdepo.htm Best
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