Heart Murmur, any knowledge out there about this??

i found out Tuesday that my unborn childs heart rate is abnormal and could possibly have a heart murmur, the doctors have tried their best to explain the details, but the medical terminology is so confusing, can anyone help me understand the pros and cons to this, im six and a half months pregnant, my baby is wildly active and her heart has all four chambers and looking good, just the heart is beating an extra beat, what's wrong??