18 weeks with my first, 19 weeks with my second and 20 weeks with my third. 11 weeks is very early to find out. Most doctors won't do your ultrasound between 14 and 15 weeks, because they like to do the gender test while doing the gestiational measurement of the baby to make sure the baby is growing and all of it's organs are developing as they should (and they do that between 18 and 20 weeks). That's actually the purpose for the ultrasound at that point. Mine wouldn't even read the gender we had to ask for them to do it, since it doesn't have much to do with your baby's development. We had a 3d ultrasound done with our first when we were right at 28 weeks. It was pretty expensive and in my opinion not worth the money. I haven't seen any of the pictures from those appointments that come out like the catalog pictures. I was really disappointed that we wasted that much money that could have gone for clothes or diapers on something so silly that I didn't even want to hang in my house. Think long and hard and talk to soem friends that have had it done for a real opinion.