The 26th come to the period cycle 30 days on the 15th cohabitating with a greater chance of pregnancy, because the 15th is in the ovulation, sperm and egg meet to form the chance of fertilization is greater.
If the menstrual cycle regular ovulation normal, have a normal sex life of women, the 26th come to 30 days of the cycle 15 coitus in the case of non-contraceptive, the chances of pregnancy is greater, because the ovulation period is generally in the menstrual period 10-15 days after the 26th of the menstrual period, the ovulation will be in the 7th – 16th or so, the 15th is in the period of ovulation, the chances of pregnancy is relatively large.
Individual women usually menstruation is very regular, suddenly the body is affected, resulting in ovulation is not normal, the 26th come to 30 days of the cycle of vacation 15 coitus will not necessarily be pregnant.