If you can’t see the gestational sac on the 41st day of pregnancy, you need to perform regular ultrasound, blood HCG and progesterone tests to rule out ectopic pregnancy. 1. Ultrasound examination: 41 days pregnant without seeing the gestational sac, then need to pay attention to perfect ultrasound examination to rule out whether the gestational sac will be deposited in the uterine cavity in other places. If the regular review ultrasound suggests that the gestational sac can be seen in the uterine cavity, then ectopic pregnancy can be ruled out. 2. Blood human chorionic gonadotropin: The blood human chorionic gonadotropin secreted by the body of a normal pregnant woman will be doubled. If a woman has an ectopic pregnancy, the blood human chorionic gonadotropin will not show a doubling trend, so pay attention to the regular review of the blood human chorionic gonadotropin can be a basic judgment of whether there is the possibility of ectopic pregnancy. It is recommended that pregnant women in the early stages of pregnancy should pay attention to more rest, more supplemental nutrients, regular obstetric examination, at any time to find the problem at any time to deal with. If abdominal pain or abnormal vaginal bleeding occurs at any time during early pregnancy, it is important to seek medical attention as soon as possible.