I found out for personal reasons with Ds2 and Ds3. Ds1 we were undecided and he just kind of flashed us so we knew.

We toss up not finding out with the next one. On one hand I think it would be a nice surprise and it might soften the blow if its another boy because the anticipation of finally knowing would be amazing. On the other hand, I think 40wks of hope for a girl and then getting a boy at the end might make things worse. We'll just see how we go.

FWIW I dont think it would change my bond at the end, knowing or not knowing. Having fully expected to not bond very well with Ds3 because he was a boy and then realising it didnt matter (we have the closest bond of all!) I dont expect either scenario to change that.