Yeah I remember feeling a bit like that - what you said about it being worse at the end of the day was also true for me.
It did go away but I couldn't tell you when! I do know I was definitely still a little bit tender by 10 weeks because DH and I waited that long to DTD for that reason.
Re the retroverted uterus, kimbaz has given a good explanation, just wanted to add that it's a "variation of normal", very common and doesn't cause any issues. Mine is also, has been since even before I had kids.