Plan b just in case. Is there any chance?

Patient

Q: My boyfriend and I rubbed generals naked the other day but he never penetrated (maybe less then a half inch). We did not use protection so I took the plan b 24 hours after we got intimate. Is there a percentage I can be pregnant with the pre cum even though I took the pill?

Symptoms:  None
Doctor

A:   Pregnancy is caused as a result of sexual intercourse only if it occurs within one's so called "fertile period". The fertile period of a woman is determined by analyzing her menstrual cycle with an ovulation calculator or fertility chart. Normally, the menstrual cycle is a 28 day cycle. During the 14th day after a period, the ovum is released. This process is called ovulation and the days 12 to 16 days after a period are said to be a woman’s most fertile period.
An emergency pill or ECP is a birth control pill that can prevent pregnancy after an unprotected intercourse. People sometimes call it the "morning after pill." But you don't have to wait until the morning after sex to take it. In fact, ECP is more effective the sooner you take it. It is a one-dose regimen: you take one pill. The pill contains 1.5 milligrams of levonorgestrel, which is used in lower doses in many birth control pills. Such emergency contraceptive pills containing Levonorgestrel are hormonal pills and thus the may cause changes in the hormonal system of the body. This may cause unscheduled vaginal bleeding giving rise to irregular menstrual pattern.
All contraceptive may fail in some, albeit rarely. ECPs have failure rates of 1-8% in most published studies, although this range varies widely across studies conducted at various centres.
A pregnancy test attempts to determine whether a woman is pregnant. Markers that indicate pregnancy are found in urine and blood, and pregnancy tests require sampling one of these substances. Most chemical tests for pregnancy look for the presence of the beta subunit of hCG, or human chorionic gonadotropin, in the blood or urine. hCG can be detected in urine or blood after implantation, which occurs six to twelve days after fertilization. Please get a pregnancy test if you miss a period and discuss the result with your doctor for specific advice.

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