It depends on your Dr. Usually its around 20 weeks but I won't find out until I'm 22 weeks. I'm 19+5 right now and I'm really anxious to know
We found out a girl at 15 weeks :)
So 20 weeks is your best bet. I found out im having a girl =]
I had mine @ 18w 3d and the doc couldent tell. I ended up in the hospital for a possible kidney stone and they gave me n ultrasound to make shure my baby was ok and that was at 20w
If you have an appt in the next four weeks you may possibly be able to find out. Most docs do a gender scan between 16-20 but try to get closer to 20 weeks so it's more accurate