4 weeks of pregnancy is 1 month and 26 weeks is 6 months and 2 weeks of pregnancy. After pregnancy from the first day of the last menstrual period to count gestational weeks, gestational months, due date, need to be calculated according to the natural week, 4 gestational weeks for 1 gestational month, and not for 30 days for 1 gestational month, due date for 40 weeks of pregnancy. However, the specific time of delivery differs from the expected date of delivery, and it is normal to deliver at 37-42 weeks of pregnancy. If you have doubts about the pregnancy cycle, you can go to the hospital for ultrasound examination to accurately calculate the number of days of pregnancy cycle. ultrasound is calculated according to the growth characteristics of the child, which is generally more accurate, especially for women with irregular menstrual cycle, ultrasound to test the pregnancy week is more reference value. After pregnancy, you should pay attention to rest, regular maternity checkups, monitoring fetal movement and fetal heart rate changes, placental maturity, amniotic fluid volume, fetal position, and seek medical attention when special conditions arise, such as redness, water breaking, regular contractions, etc.