15w on record

Kira • 💕💕💕
I have a group meeting. I hate group meetings. But I get alone time with the doctor. I'm 15 weeks 3 days according to the records, but I measured farther along last time. Which would actually make me 16 weeks. 
I was told that you have to be 16 weeks to know the gender. But in record, I'm not 16 weeks. Do you think if they can tell the gender, they will tell me? I want to know.  Not sure if being military at a military hospital affects any of this.