How Do Some Moms Know the Gender So Early ?!

Briana

I’m not a patient person at all and I want to know the gender already . I’m 13 weeks and was told I have to wait till I’m 18-20 weeks. I see so many post of women already knowing before 18 weeks ! They told me that because I’m not high risk insurance won’t cover a blood test and paying out of pocket would be like $500 . So did you pay ? Were you high risk ? ! I need answers please