How and when to buy a nursing bra ?

Hello
First time mom. Sorry. Just wondering how and when can I order a nursing bra? How will I know what sizes?
I started out as a 34c and now am in a 36DD but continuing to grow? 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors