18-22 weeks is when you can get the best/most accurate view of the "goods" - we had our ultrasound at 19 weeks and there was no questioning it was a boy! :) I would highly recommend you wait until at least 18 weeks, even though it's so hard to wait! That way you're not given a "maybe" answer, or unable to see anything without any degree of certainty. Your chances are better if you wait until the 18-22 window. Best wishes to you!
my ob says 13-15 weeks we found out at 15 weeks we're having a girl and a boy
i think 20+ weeks is the normal, but my friend just found out 2weeks ago when she was 16weeks...all depends
usually around 18-20 weeks is when its best because like kstarr said- its easier to get a clearer pictures because really until then, the parts pretty much look the same
technically I think you can find out like around 13 weeks, or something. But you should wait around 18 to get a clearer picture of the parts. It all depends on your doctor though, and when they plan on doing the anatomy scan. I'd say around 18-20 weeks.