In women with regular periods, the gestational sac can be seen on ultrasound around 5 weeks of pregnancy. Pregnancy is counted from the 1st day of the last menstrual period. A healthy, fertile woman with a history of sexual activity who normally has a regular menstrual cycle of about 28-30 days can be tested for pregnancy with a urine pregnancy test once she has had her period. The main purpose of the ultrasound in early pregnancy is to determine if the pregnancy is intrauterine and to estimate the gestational age. At around 35 days after menopause, a round or oval gestational sac can be seen in the uterine cavity, and the number and shape of the sacs can be used to determine whether the pregnancy is singleton or multiparous, and whether it is multiparous with chorionic villus. Germs and primordial heart tube pulsations can be seen at about 6 weeks of pregnancy. In women with irregular menstrual cycles, the number of weeks of pregnancy to see the gestational sac is not always possible, and requires dynamic multiple checkups may be possible. Women are advised to have regular checkups after pregnancy, and to take care of rest, proper nutrition, and maintain a regular routine.