I think the choice is yours and you already made that i think before the ultrasound, lol.
With Dd we didnt want to find out. Its special with the first. Everything is new and exciting and you dont care what it is as long as its healthy.

With #2 i had a gut feeling it was a boy. Dh didnt want to know the sex so when i had the 13 week scan he couldnt come, so i took the opportunity to find out.

I told him when i got home that i knew what the sex was and when and if he was ready then id tell him but until that time i wouldnt tell anyone else.
I totally stood by what i said to. Big secret to keep but i needed to.

He know now, i must admit it feels good to know second time round. I still wouldnt do it for the first though. Glad we didnt want to know.

Congrats, hope the birth goes well.