Hello, and I hope I can help you today. A true cornual pregnancy (also called an interstitial pregnancy) has very specific criteria for diagnosis on an ultrasound, because it is actually a type of ectopic preganacy, meaning that the pregnancy is actually located within the part of your fallopian tube that passes through the wall of your uterus. A cornual pregnancy is an emergency because the pregnancy, when it gets large enough, can rupture the tube and the wall of your uterus if it is not treated early, which can result in severe internal bleeding and even death. However, because a cornual pregnancy is not actually in the cavity of your uterus, it cannot be terminated by normal means and requires management by a specialist who may be able to treat it with methotrexate injection, or possible open or laparoscopic surgery. However, your ultrasound says the pregnancy is located in the upper corner of your uterus but it is implanted in the endometrium (meaning it is in the uterus, not the tube) so they have not actually diagnosed you with an ectopic. And at 5 weeks the gestational sac is so small that it may be difficult to accurately pinpoint the location of implantation. So you most likely have an early normal pregnancy that has just started to grow in the upper corner of your uterus, not in your tube. You can read more about diagnosis and management of interstitial pregnancy at http://radiopaedia.org/articles/interstitial-ectopic-pregnancy This is a website for health professionals but if you can understand the wording it gives accurate information. So I strongly suggest you seek a second opinion and as long as you are not bleeding and pain-free. If possible, try to get a copy of the pictures from your ultrasound and have another one in a week or two after the first so the doctor can compare the films. Make sure you see an experienced radiologist and OBGYN doctor as cornual pregnancy can be very difficult to diagnose even by experts. There is no reason for you to terminate your pregnancy if it is in your uterus. And if it is truly a cornual ectopic you will have to be managed by a gynecologic surgeon who knows how to properly treat you. Getting the correct diagnosis is the most important thing at this point, and checking progesterone levels and pregnancy hormone levels can help also in aiding the doctors in a correct diagnosis. I wan to reitirate that at this point that you Do NOT have a true cornual ectopic pregnancy but will need to be followed very closely to make sure your diagnosis is correct. PLease report to an emergency room if you develop any vaginal bleeding or severe abdominal pain. Best of luck with your situation and I hope this answer was helpful to you, Dr. Brown