Blue is correct. It basically means nothing. It won't adversely effect the pregnancy.
A retroverted uterus just means its tipped backwards. I have the opposite of yours, mines tilts forward (anteverted). I know that because yours tips back a little bit, it may take you a little longer to show. But other than that I don't think u have anything to worry about. Google it!
When it flips yes causes lot of stomach pain.. I had it for abt 2 yrs