Hi. I rarely post on here but I had to put in my two cents. I kind of agree with Ihave....find out if you can.
My third boy was a "surprise" and I wish I had found out with him because on top of finding out I didn't get my longed for DD I was now dealing with huge GD and also post partum hormones, not a pretty combo. I was a literal mess for the first two weeks of his life. I cried every waking moment and I didn't bond with him at first because I was heartbroken that he wasn't a girl. You could have a chance to let it all sink in.
If I had to do it over again I would have def. found out so I would have gotten it all out of my system by delivery day. Finding out that DS#2 was a boy was devastating at first but at least I had time to get over it and bond with him.
In my case it was not a good idea to wait for the surprise. BUT. I guess that would be the thrill of your life if they said, "its a girl" and you got to see her immediately after that.
Just wanted to put in my two cents. I have all my crossable parts crossed for you. I hope you finally get your DD.