The first thing you need to do is to take the pill. When you are about to have your period, it is a safe period, and you will not get pregnant if you have sex during this period, so it is not recommended that you take the pill. The side effects of birth control pills are very large, if you take improperly will cause menstrual disorders, endocrine disorders, often take the pill will also affect the future birth control, in the female ovulation period with the highest probability of pregnancy, ovulation is in the next menstrual period before the next 14 days or so. In the immediate menstrual period before intercourse, due to the pelvic and vaginal congestion, the vaginal resistance will be reduced, at this time of intercourse will cause gynecological infections, such as vaginitis, cervicitis, etc., it is best to observe to see the situation of leukorrhea, if there is no gynecological infections do not have to worry about. If the vulva itching, local odor may be caused by inflammation stimulation, it is best to use cleaner to wash, at the same time recommended oral metronidazole.