With PG no.1 we kept it a secret, it was nice to find out at the birth. With pg no.2 I m/c at 13 1/2 weeks, I wished that I had found out as I felt like I wanted to know something about my angel. With pg. no. 3 I was told that they couldn't tell at the 18 week ultrasound, I was very disappointed as I felt the need to know .( I found out at a later ultrasound). With pg. no. 4 we wanted to find out but were told by the lady doing the ultrasound that she didn't like to say. My DH supported me in my decisions to find out he said there were good and bad factor either way. the hardest thing is to keep the secret for people who don't want to know like my MIL.