How do I ask my DR for the Harmony test?

E ❤ • 19| Mommy of Milanirose ❤️| expecting baby #2 May, 28th! 💙

I was wondering what I say to my dr to have the test done? My OB is a bit “uptight” when it comes to any of my requests and tends to deny a lot of things that I ask for. With my last pregnancy he wouldn’t prescribe me anything for my nausea, I threw up the entire pregnancy which caused me to stop working earlier than I had planned. Very rarely did he come through with any of my requests.