Gender revel?

Christine • First baby, Boy- Tylen! DUE 7/25/16
I'm a little impatient I'm 12 weeks and I won't know the gender for 7 more weeks, when it looks like Everyone is finding out at 12-15 you guys get alternate ultrasounds besides your ob's to find out early? I also heard 3d ultrasounds are not Safe! Info please?