Wife just had second consecutive miscarriage (both at 6 weeks). We already have 2 girls with neither pregnancies having any problems and both conceived at the first time of trying. We thought it kind of strange so she went for a scan worried that there might be something there that is affecting conception. Scan found there to be a black spot in the womb though doctor said she did not know what it could be. Question... what can it be? And could something abnormal in the womb be preventing conception?