It 100% comes down to personal choice as to what works for you both but one thing you will find it how passionate people can be as to whether you should or shouldn't find out. I spend one evening with two of my bfs telling me ALL the reasons that I should find out (both of them had) only to be waylaid by one of their husbands afterwards who told me that I must NOT find out. (He didn't his wife knew but kept it secret)

I posted the same question a few weeks before our 12 week scan and found that the answers really helped me to make my decision. Originally I had been in the find out camp but then changed to the not find out. While I liked and understood the reasons behind why to find out I preferred the idea of it being my husband who will tell me what we've had rather than the sonographer who we will never see again. Several ladies pointed out that this is especially important if the birth isn't what you have planned ie c/s instead of natural.

My husband however had wanted to find out but agreed not to for me. He keeps saying that he wants a boy and has told me that either way he's going to tell me its a boy when its born. Am fairly sure he is only joking but would love to see my OBs and the midwifes faces if he carried through with this threat and it was a girl

Best of luck with making your decision either way.

PS if you don't know you can also have a giggle with your girlsfriends doing the various old wives tales to guess the sex