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sometimes i take yaz 3-5 hours late, no chance?

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I've been on birth control (yazz) for about 3 years now. I never miss one, but sometimes i take them 3-5 hours late from the time i usually take it. Last week i had sex and the condom ripped, so, for extra precaution i took a morning after pill (levonorgestrel) about 53 hours later. I was supposed to get my period yesterday (on the 2nd day of the white pill), but i haven't and im always very regular. I have no signs of my period or anything. But i have been feeling nauseous, dizzy and constipated. Should i be worried? Can this cause any irregularity on my menstrual cycle? Theres almost no way i can be pregnant right? (FYI: i also had sex last month, but i got my period as i regularly would, even though it was light and didnt last all 6 days, just about 4 days).

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replied August 3rd, 2012
Sexual Health - Women Answer A37658
Welcome to ehealthforum,
The delay in your usual periods could be due to the intake of ECP. If you have taken the birth control pills late by more than 2-3 hours on 2 or more than 2 occasions, you can be at risk for pregnancy (as the effective protection from the birth control pills will not be present). If you had taken emergency contraceptive pill within 48-72 hours of unprotected sexual contact, it should work in preventing pregnancy (provided you were not sexually active without protection after taking it). Since the emergency contraceptives contain high doses of hormones, these can disrupt the normal hormonal and period pattern causing period/bleeding abnormalities and appearance of new symptoms. Wait and watch for your next periods which can be delayed. Look out for development of any other new symptoms if pregnancy is suspected. If pregnancy is suspected (as suggested by your last lighter and shorter periods), or if you miss your periods, or if you have abnormal periods, or if periods do not start within 10 days of expected period date, consider visiting your doctor/gynecologist at the earliest for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately).
Take care.

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