How many days is pregnancy safe?

Pregnancy safety period is a few days, to see menstruation is not regular. If menstruation rules, every month on time, menstrual cycle 28 to 30 days, generally 14 days before the next menstrual cramps is ovulation day. Ovulation day before and after five days are likely to be fertilized in the same room, is ovulation period. That is, the middle of the menstrual cycle is ovulation period, ovulation period is likely to be pregnant in the same room, other times generally not easy to fertilize in the same room. Therefore, if menstruation is irregular, you must take good contraceptive measures every time you share the same room, and try to wear condoms throughout. The above health science knowledge is for reference only, and the specific situation needs to be checked in a regular hospital, and judged by a professional doctor.