The period that is menstruation, there are 7 days to menstruation chest up the chance of conception is low, but not absolutely no possibility. If a woman’s usual menstrual cycle is more regular in 28 days or so, 7 days before menstruation is generally not ovulation, chest rise may be soon to menstruation before the hormone level increase caused by breast swelling after menstruation symptoms will be alleviated and disappeared, at this time and then cohabit the chances of pregnancy are not great. If women usually irregular menstruation, the time of ovulation is not fixed, 7 days before menstruation may also be ovulation, at this time, if you do not take contraceptive measures will have the opportunity to get pregnant, you can use ovulation paper or ultrasound to monitor whether there is a dominant follicle, such as the dominant follicle can be reasonable arrangements for sex to increase the chances of conception.