BICORNUATE UTERUS?? so worried :/

Ladies I had a miscarriage back in June and the hosiptal and my OBYGN  said that my uterus was healthy so I'm quite confused why all the sudden this bicornuate uterus showed up this time. I'm only 5 weeks 3 days as of today. Could they of misdiagnosed me by any chance? & if not have any of you ladies had this heart shaped uterus and carried a healthy baby?? What was it like?