There are many reasons for 44 days with yolk sac and no fetal heartbeat and buds, there are normal conditions, such as irregular menstruation, wrong time of ovulation, more intestinal gas affecting the test results; there may also be abnormal conditions, such as fetal arrest. Further observation for more than one week is needed before going for the test. 1. Normal situation: 44 days with yolk sac and no fetal heartbeat and buds may be caused by wrong ovulation, if menstruation is not normal and ovulation is wrong, then the pregnancy time is less than 44 days, so you can’t see the fetal heartbeat and buds; due to the accumulation of gas in the intestinal cavity, unsatisfactory holding of urine, abdominal fat is too thick, or due to the position of the uterus causes the observation angle is unsatisfactory, and so on, which will affect the test results. 2. Abnormalities: Poor embryonic development or fetal arrest are possible. Fetal arrest occurs due to the poor quality of the embryo after pregnancy. If you have a yolk sac but no fetal heartbeat and buds at 44 days, you need to be examined by a doctor according to your specific situation to make a diagnosis and formulate an individualized diagnosis and treatment plan, so as to avoid delaying the best time for treatment.