Inaccurate menstrual cycle needs to follow the ultrasound examination, the time of ovulation and other methods to estimate the number of days of pregnancy.
1. Ultrasound: Ultrasound is the most accurate way to estimate the number of days of pregnancy, you can estimate the number of weeks of pregnancy according to the ultrasound, and then use this to estimate the time of the last menstrual period, and then launch the time of pregnancy, the expected date of delivery and so on.
2. The time of ovulation: even if the menstrual period is not accurate, the time of ovulation is generally 14 days before the next menstrual period, and the number of days of ovulation can be deduced from this to launch the number of days of pregnancy.
3. Other: In addition to these two methods can also be through the time of coitus, do a blood test of human chorionic gonadotropin growth and other methods to calculate the pregnancy week.
It is recommended to go to the hospital, complete the relevant examinations, and cooperate with the doctor to deduce the specific week of pregnancy.