"Probably" a girl

At my ultrasound the techs exact words were "in my personal opinion, I think it's probably a girl". She said the front of the pelvis was flat and there were the three lines which indicate a girl and she didn't see any "boy bits" but she didn't give me any potty shots to obsess over 😂 I'll hopefully be getting a 3d ultrasound in the next couple weeks but is it safe to start buying girl clothes? My mum has already gone crazy shopping but I've only bought one thing, just in case 😅 💕