It is not normal to have an ultrasound without a gestational sac at 40 days of pregnancy, both inside and outside the uterus. If you have regular periods, you should see the gestational sac on the 35th day of menopause during a vaginal ultrasound. In the case of abdominal ultrasound, the gestational sac should also be visible on day 40 of menopause. If the gestational sac is not visible at this time, it is possible that the pregnancy is ectopic and further tests must be done to look dynamically at the chorionic gonadotropin in the blood. If the pregnancy is intrauterine, it will double within 48 hours. If it does not double within 48 hours or if there is also pelvic fluid, pain in the lower abdomen or irregular vaginal bleeding, the possibility of ectopic pregnancy is very high and further examination is necessary.