When could you find out baby’s sex?

A

Hi. I keep seeing people posting that they are finding out the sex of their baby around week 18-20. I was able to find out the sex of my baby at 12 weeks by a blood test. They are able to extract the babies DNA from my blood. We opted not to find out the gender but the office called me on 11/8 to ask if I wanted to know the result. We conceived the weekend of 8/30.

Why are some waiting so long to find out? Is this blood test not an option? Just curious :)

Edit—-I am not a high risk pregnancy, or a “geriatric pregnancy” and this was covered in my health insurance plan.