Acronyms?

Krystal • Married 5/26/18. TTC baby #1

Hey everybody! I am new to the <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> and I am getting off birth control Friday. I have been reading all of these posts and there’s a lot of different acronyms and I have no idea what they stand for. Could someone please explain?