17 weeks and a few days

We went and did a 3d ultrasound today and lil butt was not wanting to play nice but we managed to get a few photos. The tech says its a boy but me and my husband couldn't tell how she determined this. The image was unclear to us on if it was a boy. Mind you if it is this would be the 5th boy. I know we were hoping it was a girl but we wouldnt mind another boy but it just doesnt look like a boy to us. I go to my 20 week scan oct. 23 and we are waiting to annocence till then cus im feeling really unsure at this time.

Has anyone else had this happen? Does anyone have any ultrasound pics at 17 weeks and what did u have?

(Updated with a photo... Tell me what you think. The lady said where she had the arrows pointing was the legs and that its a view as if lil one was sitting on a glass table or something she was confusing. He was facing my spine with his back against my stomach and she had to have me on my side to try and get this picture)