The last menstrual period is April 14th and the expected date of delivery is January 21st of the following year, which can be checked and projected by a professional doctor. For women with confirmed normal pregnancy in early trimester, the week of pregnancy needs to be checked by a medical professional based on the ultrasound results of early trimester, such as the size of the gestational sac or fetus, the head-butt length, etc. The expected date of delivery should also be projected. For women with regular menstrual cycle, the due date can be calculated from the first day of the last menstrual period, the number of days should be added 7, and the month should be subtracted 3 or added 6, so the due date of the last menstrual period on April 14th will be January 21st of the following year. Women with irregular periods will need an early pregnancy ultrasound to assist in the projection, when the ultrasound and the week of pregnancy of the last menstrual period differ considerably, the ultrasound is the mainstay. From early pregnancy onwards, it is necessary to under the guidance of the doctor to be on time for maternity checkups and to begin to carry out the appropriate detector tests, such as NT (fetal nuchal translucency) measurement at 11-13⁺⁶ weeks, mid-pregnancy serological examination at 15-20 weeks, and ultrasound examination of the structure of the fetal system at 20-24 weeks, etc., and it is also necessary to begin to ensure that a reasonably well-balanced diet is taken at the mid-pregnancy stage, so as to satisfy the mother’s and the fetus’s It is also necessary to ensure a reasonably balanced diet from the middle of pregnancy to meet the needs of the mother and the fetus.