She could still be pregnant... Check out the site below:
http://en.wikipedia.org/wiki/Emergency_contraception
Effectiveness estimate calculation
Early studies of emergency contraceptives did not attempt to calculate a failure rate, they simply reported the number of women who became pregnant after using an emergency contraceptive. Since 1980, clinical trials of emergency contraception have estimated effectiveness using: observed pregnancies divided by the estimated (by cycle day) number of women who would have become pregnant without treatment.[22]
In their April 2007 emergency review article, Trussell and Raymond note:
Calculation of effectiveness, and particularly the denominator of the fraction, involves many assumptions that are difficult to validate. Therefore, reported figures on the efficacy of emergency contraception may be underestimates or, more probably, overestimates. Yet, precise estimates of efficacy may not be highly relevant to many women who have had unprotected intercourse, since ECPs are often the only available treatment. A more important consideration for most ECP clients may be the fact that data from both clinical trials and mechanism of action studies clearly show that at least the levonorgestrel regimen of ECPs is more effective than nothing.[23]
* Eight studies of the progestin-only (levonorgestrel) regimen, that included more than 9,500 women, reported effectiveness estimates between 59% and 94%.[23]
* A meta-analysis of eight studies of the combined (Yuzpe) regimen, that included more than 3,800 women and reported effectiveness estimates between 56% and 89%, concluded that the best point estimate of effectiveness was 74%.[23][24]
* A more recent analysis of two of the largest combined (Yuzpe) regimen studies, using possibly more accurate estimates of conception probabilities by cycle day, found effectiveness estimates of 47% and 53%.[3][23][25][26]
* Combined data from two randomized trials that directly compared the two regimens, found the levonorgestrel regimen was twice as effective as the Yuzpe regimen.[3][18][23][27][28]
Placebo-controlled trials that could give a precise measure of effectiveness for EC would be unethical, so the effectiveness percentage is estimated. This is currently done using variants of the calendar method.[29] Women with irregular cycles for any reason (including recent hormone use such as oral contraceptives and breastfeeding) must be excluded from such calculations. Even for women included in the calculation, the limitations of calendar methods of fertility determination have long been recognized. Recently, hormonal assay has been suggested as a more accurate method of estimating fertility for EC studies.[30]
2007-11-01 18:10:13
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answer #1
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answered by Terri 7
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there is extremely no way of telling if she is pregnant or no longer on the 2nd, If the condom ripped, then it became a foul option to no longer be on delivery administration. yet on account that she took the morning after pill, then i'd think of her probabilities of being pregnant are narrow. she would have the means to take the attempt interior 2 weeks
2016-09-28 04:02:49
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answer #2
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answered by ? 4
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