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There are several contraceptive
methods which are available today. From what can be inferred, you are interested in the rhythm method of contraception
. In this method, the woman is considered to be at low risk of conceiving during the 1st 8 days of the cycle and from day 20 to the day her menses begin. The 1st day of the period is considered to be the 1st day of the cycle. However, this method has a high failure rate which ranges from 13-20%.
"I Pill" contains levonorgestrel
and is considered suitable only as an emergency contraceptive method. It is not supposed to be used as a regular contraceptive since it has several disadvantages. It makes the menstrual cycles irregular and also does not protect against sexually transmitted diseases. Additionally, the failure rate is approximately 4% which increases to 10% at 5 days. I would strongly recommend you to consult your physician and adopt a regular contraceptive method which has several advantages apart from just preventing pregnancy