Ellie,

I have had the same thing as you, retroverted Uterus, sometimes it takes a little longer than usual, and my OBGYN has also told me that blighted ovum is another classical symptom of a retrovered uterus, I hope this helps but with our DS who is 14 months it took till 8 weeks for heartbeat to pickup...
All the best sweetie will be thinking baby thoughts for you!!!!!!

Lindie